A123259 a(n) = A123228(n)/2.

3, -7, 11, 233, -3357, 25673, -102709, -319207, 9893763, -97727527, 563250251, -818302327, -23939051037, 331342081193, -2482627432309, 9536407068473, 35533850058243, -988203251837767, 9543386061052811, -53687973726459607, 64388654104236003, 2442458092308867593

Offset

0,1

Links

Table of n, a(n) for n=0..21.

Index entries for linear recurrences with constant coefficients, signature (-13,-74,-74,-13,-1).

Formula

From Elmo R. Oliveira, May 11 2026: (Start)

a(n) = -13*a(n-1) - 74*a(n-2) - 74*a(n-3) - 13*a(n-4) - a(n-5).

G.f.: (3+32*x+142*x^2+80*x^3+7*x^4) / ((1+x) * (1+12*x+62*x^2+12*x^3+x^4)). (End)

Prog

(PARI) polsym(x^6 + 14*x^5 + 87*x^4 + 148*x^3 + 87*x^2 + 14*x + 1, 30)/2 \\ Charles R Greathouse IV, Jul 20 2016

Crossrefs

Cf. A123228.

Sequence in context: A082599 A354082 A378953 * A116605 A361090 A323339

Adjacent sequences: A123256 A123257 A123258 * A123260 A123261 A123262

Keyword

sign,easy

Author

N. J. A. Sloane, Nov 12 2006

Status

approved