PROG
(MAGMAMagma) I:=[0, 1, 12, 42]; [n le 4 select I[n] else 4*Self(n-1)-6*Self(n-2)+4*Self(n-3)-Self(n-4) : n in [1..50]]; // Vincenzo Librandi, Feb 12 2014
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Revision History for A007586
(Bold, blue-underlined text is an addition; faded, red-underlined text is aShowing entries 1-10 | older changes
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FORMULA
From Amiram Eldar, Jun 28 2020: (Start)
Sum_{n>=1} 1/a(n) = (9*log(3) + sqrt(3)*Pi - 4)/10.
Sum_{n>=1} (-1)^(n+1)/a(n) = (sqrt(3)*Pi + 2 - 4*log(2))/5. (End)
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COMMENTS
Starting with 1 equals binomial transform of [1, 11, 19, 9, 0, 0, 0, ...]. - Gary W. Adamson, Nov 02 2007
EXAMPLE
From __Vincenzo Librandi_, Feb 12 2014: (Start)
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EXAMPLE
From Vincenzo Librandi, Feb 12 2014: (Start)
6, 50, 76, 84, 74, 46; etc. - _Vincenzo Librandi_, Feb 12 2014(End)
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