OFFSET
1,1
FORMULA
Empirical (for n>=6): a(n) = 19*a(n-1) - 98*a(n-2) + 180*a(n-3) - 80*a(n-4) - 16*a(n-5). - Vaclav Kotesovec, Nov 28 2012
Empirical g.f.: x*(7 - 45*x + 88*x^2 - 40*x^3 - 8*x^4) / (1 - 19*x + 98*x^2 - 180*x^3 + 80*x^4 + 16*x^5). - Colin Barker, Oct 12 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 22 2002
STATUS
approved