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

Author

N. J. A. Sloane, Jul 05 2015

Keywords

• sign

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.

Crossrefs

Cf. A259708.

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

Extensions

More terms from Eric M. Schmidt, Jul 10 2015