A115324 Central terms of the rows of triangle A115323.

1, 1, 2, 4, 9, 22, 55, 141, 371, 997, 2712, 7440, 20542, 57056, 159343, 447045, 1259443, 3561529, 10119910, 28892841, 82727805, 237322575, 681862156, 1961930899, 5653182325, 16312268162, 47133250093, 136366337701

Offset

0,3

Comments

Limit a(n+1)/a(n) = 3.

Links

Table of n, a(n) for n=0..27.

Crossrefs

Sequence in context: A290996 A373245 A198520 * A196307 A107092 A352702

Adjacent sequences: A115321 A115322 A115323 * A115325 A115326 A115327

Keyword

nonn

Author

Paul D. Hanna, Jan 20 2006

Status

approved