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

Author

Paul D. Hanna, Jan 20 2006

Keywords

• nonn

Comments

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