A046106 G.f.: g.f. for A001411 / g.f. for A004018.

1, 0, 8, 4, 48, 68, 284, 684, 1816, 5608, 12684, 42068, 92916, 304100, 688988, 2170020, 5088784, 15436172, 37281880, 109786204, 271062388, 781016892, 1958863988, 5555714820, 14090644980, 39503105472, 101000072900, 280693435596

Offset

0,3

Links

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

Example

1 + 4*q + 12*q^2 + 36*q^3 + 100*q^4 + 284*q^5 + 780*q^6 + 2172*q^7 + 5916*q^8 + 16268*q^9 + ... / 1 + 4*q + 4*q^2 + 4*q^4 + 8*q^5 + 4*q^8 + 4*q^9 + ... = 1 + 8*q^2 + 4*q^3 + 48*q^4 + 68*q^5 + 284*q^6 + 684*q^7 + 1816*q^8 + 5608*q^9 + ...

Crossrefs

Cf. A001411, A004018.

Sequence in context: A270934 A271004 A271051 * A112584 A112546 A112583

Adjacent sequences: A046103 A046104 A046105 * A046107 A046108 A046109

Keyword

nonn

Author

N. J. A. Sloane, based on a suggestion of Maurice Craig (Maurice.D.Craig(AT)BHPBilliton.com), May 11 2003

Status

approved