A147725 Row sums of triangle in A147724.

1, 2, 10, 68, 502, 3770, 28408, 214202, 1615330, 12181748, 91867102, 692804690, 5224704088, 39401485202, 297141621850, 2240858259428, 16899166494502, 127443057596810, 961096686931768, 7247996548821002, 54659905383139570

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Formula

a(n)=9*a(n-1)-11*a(n-2) for n>2, a(0)=1, a(1)=2, a(2)=10. G.f.: (1-7x+3x^2)/(1-9x+11x^2).

Crossrefs

Sequence in context: A208561 A152620 A152621 * A074603 A110520 A136633

Adjacent sequences: A147722 A147723 A147724 * A147726 A147727 A147728

Keyword

nonn

Author

Philippe Deléham, Nov 15 2008

Status

approved