OFFSET
1,2
COMMENTS
Column 3 of A221396.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 48*a(n-2) - 440*a(n-4) + 998*a(n-6) - 873*a(n-8) + 252*a(n-10) + 16*a(n-12).
Empirical g.f.: x^2*(18 - 233*x^2 + 820*x^4 - 1050*x^6 + 412*x^8 + 46*x^10) / ((1 - x)*(1 + x)*(1 - 47*x^2 + 393*x^4 - 605*x^6 + 268*x^8 + 16*x^10)). - Colin Barker, Aug 05 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 14 2013
STATUS
approved