A051515 (Terms in A014738)/4.

9, 25, 196, 324, 1089, 1521, 3600, 4624, 9025, 11025, 19044, 22500, 35721, 41209, 61504, 69696, 99225, 110889, 152100, 168100, 223729, 245025, 318096, 345744, 439569, 474721, 592900, 636804, 783225, 837225, 1016064, 1081600, 1297321

Offset

1,1

Links

Table of n, a(n) for n=1..33.

Index entries for linear recurrences with constant coefficients, signature (1,4,-4,-6,6,4,-4,-1,1).

Formula

From Chai Wah Wu, Feb 03 2021: (Start)

a(n) = a(n-1) + 4*a(n-2) - 4*a(n-3) - 6*a(n-4) + 6*a(n-5) + 4*a(n-6) - 4*a(n-7) - a(n-8) + a(n-9) for n > 9.

G.f.: x*(-9*x^6 - 16*x^5 - 135*x^4 - 64*x^3 - 135*x^2 - 16*x - 9)/((x - 1)^5*(x + 1)^4). (End)

Crossrefs

A014738.

Sequence in context: A014728 A223646 A018929 * A328714 A337344 A053929

Adjacent sequences: A051512 A051513 A051514 * A051516 A051517 A051518

Keyword

nonn

Author

James A. Sellers

Status

approved