OFFSET
1,2
FORMULA
a(n) = ((2*n +1)*(2*n^2 + 2*n -1)+ 5*(-1)^n)/4; a(n) = a(n-1)+2n^3; G.f. = (1 - 2*x + 14*x^2 - 2*x^3 + x^4)/((1 + x)(1 - x)^4).
MATHEMATICA
Table[((2*n +1)*(2*n^2 + 2*n -1)+ 5*(-1)^n)/4, {n, 83}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Mar 18 2007
STATUS
approved