OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..5558
FORMULA
Empirical: a(n) = a(n-1) +a(n-2) -a(n-3) +a(n-4) for n>12.
G.f.: (8*x^12+8*x^11-4*x^10-8*x^8+6*x^7+20*x^6-7*x^5-16*x^4-4*x^3-1) / (x^4-x^3+x^2+x-1). - Alois P. Heinz, Apr 08 2020
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. H. Hardin, Oct 23 2015
EXTENSIONS
a(0), a(24)-a(39) from Alois P. Heinz, Apr 08 2020
STATUS
approved