A108984 Inverse binomial transform of A003951.

1, 8, 55, 386, 2701, 18908, 132355, 926486, 6485401, 45397808, 317784655, 2224492586, 15571448101, 109000136708, 763000956955, 5341006698686, 37387046890801, 261709328235608, 1831965297649255, 12823757083544786

Offset

0,2

Links

Table of n, a(n) for n=0..19.

Formula

a(n) = 6*a(n-1) + 7*a(n-2), a(0) = 1, a(1) = 8.

a(2*n) = 7*a(2*n-1) - 1; a(2*n+1) = 7*a(2*n) + 1.

O.g.f.: -(1+2*x)/((1+x)*(7*x-1)). - R. J. Mathar, Apr 02 2008

Crossrefs

Sequence in context: A308687 A010918 A019484 * A264342 A230963 A209114

Adjacent sequences: A108981 A108982 A108983 * A108985 A108986 A108987

Keyword

nonn

Author

Philippe Deléham, Jul 23 2005

Extensions

More terms from R. J. Mathar, Apr 02 2008

Status

approved