OFFSET
1,2
COMMENTS
a(n) <= A166060(n).
FORMULA
Conjectures from Colin Barker, May 29 2015: (Start)
a(n) = 3*a(n-1)+a(n-2)-4*a(n-3)-2*a(n-4) for n>4.
G.f.: x*(5*x^2+3*x+1) / ((x^2+x-1)*(2*x^2+2*x-1)).
(End)
PROG
(Haskell)
a257956 = sum . a232642_row
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, May 14 2015
STATUS
approved