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
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Jul 05 2015
EXTENSIONS
More terms from Eric M. Schmidt, Jul 10 2015
STATUS
approved