A120901 Central terms of triangle A120898 (cascadence of 1+2x+x^2).

1, 1, 5, 14, 43, 156, 535, 1956, 7175, 26418, 98375, 367176, 1378022, 5193625, 19641164, 74535167, 283651169, 1082274210, 4139129734, 15863315213, 60913982404, 234317240601, 902804442380, 3483620505111, 13460665855850

Offset

0,3

Links

Table of n, a(n) for n=0..24.

Crossrefs

Cf. A120898, A120899, A120900, A120902.

Sequence in context: A296829 A102434 A186649 * A222988 A349222 A327594

Adjacent sequences: A120898 A120899 A120900 * A120902 A120903 A120904

Keyword

nonn

Author

Paul D. Hanna, Jul 14 2006

Status

approved