OFFSET
0,1
COMMENTS
Fourfold iterated sums of squares; see A060061 for threefold case.
LINKS
T. D. Noe, Table of n, a(n) for n = 0..1000
FORMULA
G.f. (1385+32516*x+114318*x^2+87156*x^3+11025*x^4)/(1-x)^13 = p(4, x)/(1-x)^(4*3+1) with p(2, x)=sum(A060063(4, m)*x^m, m=0..4).
MATHEMATICA
CoefficientList[Series[(1385+32516*x+114318*x^2+87156*x^3+11025*x^4)/(1-x)^13 , {x, 0, 20}], x] (* Indranil Ghosh, Feb 21 2017 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Mar 16 2001
STATUS
approved