A135903 Column 0 of triangle A135902; also equals column 2 of triangle A135902 (shift right).

1, 1, 3, 15, 102, 860, 8548, 97094, 1234324, 17302880, 264503376, 4371376170, 77567318328, 1469440535360, 29578625457508, 630090773216810, 14155112389880376, 334337856517696916, 8280411098557369468

Offset

0,3

Links

Table of n, a(n) for n=0..18.

Crossrefs

Cf. A135902; A135904, A135905.

Sequence in context: A242003 A265164 A348793 * A185753 A174493 A354122

Adjacent sequences: A135900 A135901 A135902 * A135904 A135905 A135906

Keyword

nonn

Author

Paul D. Hanna, Dec 18 2007

Status

approved