OFFSET
0,2
FORMULA
PROG
(PARI) a000143(n) = if(n==0, 1, 16*sumdiv(n, d, (-1)^(n+d)*d^3));
a(n) = a000143(n^2);
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jul 12 2024
STATUS
approved