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A368788
a(n) = (n+1) * (n!)^3 * Sum_{k=1..n} 1/((k+1) * (k!)^3).
1
0, 1, 13, 469, 37521, 5628151, 1418294053, 555971268777, 320239450815553, 259393955160597931, 285333350676657724101, 414304025182507015394653, 775577135141653132818790417, 1835015501745151312249258126623
OFFSET
0,3
FORMULA
a(0) = 0; a(n) = (n+1) * n^2 * a(n-1) + 1.
a(n) = A368775(n) - (n+1) * (n!)^3.
PROG
(PARI) a(n) = (n+1)*n!^3*sum(k=1, n, 1/((k+1)*k!^3));
CROSSREFS
Cf. A368775.
Sequence in context: A262570 A012073 A012143 * A173403 A220560 A033983
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jan 05 2024
STATUS
approved