OFFSET
0,1
COMMENTS
The denominators are A038500(n+1), n >= 0.
LINKS
FORMULA
a(n) = numerator(r(n)) with the rationals r(n) = [x^n/n!] ((1 + 3*x)/x)*(1 - (1 + 3*x)^(-2/3)).
EXAMPLE
The rationals r(n) = z(3,1;n) = a(n)/A038500(n+1) begin: {2, 1, -10/3, 20, -176, 6160/3, -29920, 523600, -96342400/9, 250490240, -6603833600, 581137356800/3, -6258402304000, 220832195584000, -25351536053043200/3, 348583620729344000, ...}.
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Wolfdieter Lang, Sep 13 2017
STATUS
approved