A056237 - OEIS

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A056237

a(n) = 2*n^2 + 9*n - 5.

6, 21, 40, 63, 90, 121, 156, 195, 238, 285, 336, 391, 450, 513, 580, 651, 726, 805, 888, 975, 1066, 1161, 1260, 1363, 1470, 1581, 1696, 1815, 1938, 2065, 2196, 2331, 2470, 2613, 2760, 2911, 3066, 3225, 3388, 3555, 3726, 3901, 4080, 4263, 4450, 4641, 4836, 5035

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OFFSET

1,1

REFERENCES

Michael Serra, Discovering geometry: an inductive approach, 2nd ed., Berkeley, Calif.: Key Curriculum Press, 1997, p. 61, Problem 8.

LINKS

Table of n, a(n) for n=1..48.

Index entries for linear recurrences with constant coefficients, signature (3,-3,1).

MATHEMATICA

Table[2n^2+9n-5, {n, 50}] (* Harvey P. Dale, May 30 2021 *)

CROSSREFS

Sequence in context: A007339 A363621 A225150 * A364169 A364171 A199194