A027501 First diagonal of A027496.

1, 1, 4, 4, 45, 121680, 895412700, 765208749487, 23131167341635600, 1241298775946837183769648, 88337130010856531512760631670, 1708369803301228434760503165381979211286000

Offset

1,3

Links

Table of n, a(n) for n=1..12.

Formula

Numerators of sequence a[ n, n ] in (a[ i, j ])^3 where a[ i, j ] = S(i, j)/BellNumber(i) if j<=i, 0 if j>i

Crossrefs

Sequence in context: A269913 A197933 A198005 * A341108 A189102 A220778

Adjacent sequences: A027498 A027499 A027500 * A027502 A027503 A027504

Keyword

nonn

Author

Olivier Gérard

Status

approved