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A106472 Expansion of (1+x)(1-x)^2/(1-2x)^2. 1
1, 3, 7, 17, 40, 92, 208, 464, 1024, 2240, 4864, 10496, 22528, 48128, 102400, 217088, 458752, 966656, 2031616, 4259840, 8912896, 18612224, 38797312, 80740352, 167772160, 348127232, 721420288, 1493172224, 3087007744, 6375342080 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Binomial transform of A029578(n+2). Row sums of number triangle A106471.

FORMULA

a(0)=1, a(1)=3, and a(n) = (3*n + 8)*2^(n-3), for n>=2.

CROSSREFS

Sequence in context: A077927 A005197 A147142 * A036885 A137682 A190360

Adjacent sequences:  A106469 A106470 A106471 * A106473 A106474 A106475

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), May 03 2005

EXTENSIONS

Formula simplified by Ralf Stephan, Nov 16 2010.

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Last modified February 15 12:10 EST 2012. Contains 205783 sequences.