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A155159
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a(n) = 1 + 2*n*n!.
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1
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1, 3, 9, 37, 193, 1201, 8641, 70561, 645121, 6531841, 72576001, 878169601, 11496038401, 161902540801, 2440992153601, 39230231040001, 669529276416001, 12093372555264001, 230485453406208001, 4622513815535616001
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listen;
history;
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internal format)
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OFFSET
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0,2
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LINKS
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FORMULA
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E.g.f.: exp(x) + 2*x/(1-x)^2. (End)
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MAPLE
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MATHEMATICA
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Table[1 + 2*n*n!, {n, 0, 30}]
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PROG
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(Magma) [1 + 2*n*Factorial(n): n in [0..30]]; // G. C. Greubel, Mar 20 2021
(Sage) [1 + 2*n*factorial(n) for n in (0..30)] # G. C. Greubel, Mar 20 2021
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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