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A120896 Central terms of triangle A120894 (cascadence of 1+x+x^2). 3
1, 1, 2, 5, 10, 27, 73, 189, 518, 1413, 3857, 10707, 29804, 83365, 234665, 662654, 1878059, 5341302, 15231940, 43552610, 124829236, 358537455, 1031835260, 2974872009, 8590929683, 24847042484, 71964879243, 208704926659 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

CROSSREFS

Cf. A120894, A120895, A120897.

Sequence in context: A221843 A032099 A243797 * A074801 A324838 A257889

Adjacent sequences:  A120893 A120894 A120895 * A120897 A120898 A120899

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jul 14 2006

STATUS

approved

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Last modified December 8 00:04 EST 2021. Contains 349590 sequences. (Running on oeis4.)