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A120901 Central terms of triangle A120898 (cascadence of 1+2x+x^2). 3
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 (list; graph; refs; listen; history; text; internal format)
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 A327594 A034530

Adjacent sequences:  A120898 A120899 A120900 * A120902 A120903 A120904

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jul 14 2006

STATUS

approved

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Last modified January 24 06:21 EST 2021. Contains 340398 sequences. (Running on oeis4.)