A259709 a(n) = A259708(n,n-1).

0, -1, 0, 4, 22, 78, 240, 679, 1828, 4762, 12132, 30432, 75504, 185875, 455040, 1109540, 2697698, 6545670, 15859128, 38384099, 92832716, 224399570, 542226888, 1309862496, 3163659744, 7640066759, 18448657344, 44545569508, 107553559150, 259675788510

Offset

1,4

Links

Eric M. Schmidt, Table of n, a(n) for n = 1..300

L. Carlitz, Some polynomials related to Fibonacci and Eulerian numbers, Fib. Quart., 16 (1978), 217. (Annotated scanned copy)

L. Carlitz, Some polynomials related to Fibonacci and Eulerian numbers, Fib. Quart., 16 (1978), 216-226.

Formula

Empirical: a(n) = 4*a(n-1) - 2*a(n-2) - 6*a(n-3) + 2*a(n-4) + 4*a(n-5) + a(n-6). - Eric M. Schmidt, Jul 10 2015

Empirical: G.f.: -x^2*(-1+2*x^2+4*x) / ( (x^2+2*x-1)*(x^2+x-1)^2 ). - R. J. Mathar, Jul 15 2015

Crossrefs

Cf. A259708.

Sequence in context: A062966 A347722 A201127 * A078155 A237530 A096167

Adjacent sequences: A259706 A259707 A259708 * A259710 A259711 A259712

Keyword

sign

Author

N. J. A. Sloane, Jul 05 2015

Extensions

More terms from Eric M. Schmidt, Jul 10 2015

Status

approved