A105849 Row sums of number triangle A105848.

1, 3, 9, 28, 91, 308, 1079, 3888, 14332, 53810, 205075, 791250, 3084504, 12129506, 48056095, 191633546, 768535768, 3097705378, 12541851048, 50983349848, 208003171266, 851412895348, 3495527318559, 14390543072502, 59393240482618

Offset

0,2

Comments

Binomial transform of A105633.

Links

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

Formula

G.f.: (1-2x-sqrt((1-6x+8x^2-4x^3)/(1-2x)))/(2x^2).

Conjecture: (n+2)*a(n) +2*(-4*n-3)*a(n-1) +4*(5*n-2)*a(n-2) +2*(-10*n+17)*a(n-3) +8*(n-3)*a(n-4)=0. - R. J. Mathar, Nov 16 2012

Crossrefs

Sequence in context: A071756 A176673 A215007 * A243156 A228449 A368288

Adjacent sequences: A105846 A105847 A105848 * A105850 A105851 A105852

Keyword

easy,nonn

Author

Paul Barry, Apr 22 2005

Status

approved