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

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

Adjacent sequences: A056234 A056235 A056236 * A056238 A056239 A056240

Keyword

nonn,easy,less

Author

Pam Smith (homelizard(AT)aol.com), Aug 20 2000

Extensions

Name clarified by Editors of OEIS, May 24 2021

More terms from Harvey P. Dale, May 30 2021

Status

approved