OFFSET
1,2
COMMENTS
If the D.g.f. is squared we get A031362.
PROG
(PARI)
t4=direuler(p=2, M, (1+(p%5<2)*X)) \\ p == 0 or 1 mod 5
t5=direuler(p=2, M, 1/(1+(p%5<1)*X)) \\ p == 0 mod 5
t6=dirmul(t4, t5) \\ p == 1 mod 5
t7=direuler(p=2, M, 1/(1-(p%5<2)*X))
t8=direuler(p=2, M, (1-(p%5<1)*X))
t9=dirmul(t7, t8)
t10=dirmul(t6, t9)
t11=vector(100, n, t10[10*n+1]) \\ (and then prepend 1)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 15 2019.
STATUS
approved