A181350 Denominators of row sums of the triangle (lower triangular matrix) log(F) with F:=A037027 (Fibonacci convolution matrix).

1, 1, 1, 2, 3, 2, 15, 5, 210, 105, 210, 35, 2310, 693, 6006, 36036, 2145, 90090, 765765, 1531530, 106590, 1711710, 5819814, 5290740, 334639305, 30421755, 334639305, 9561123, 74364290, 39369330

Offset

0,4

Comments

The corresponding numerator sequence is A181349.

Links

Table of n, a(n) for n=0..29.

Formula

a(n) = denominator(sum(T[n,m], m=0..n)), with the matrix T:=log(F), where F:=A037027. Offset of the lower triangular matrix T is [0,0].

Example

The signed rational sequence A181349(n)/A181350(n) starts with [0, 1, 3, 9/2, 17/3, 15/2, 142/15, 52/5, 2371/210, 1481/105, 3673/210, 576/35, 23341/2310, 10085/693, 344857/6006, 3298871/36036, -296356/2145 ,...].

Crossrefs

Sequence in context: A160819 A299700 A205441 * A174111 A367566 A164661

Adjacent sequences: A181347 A181348 A181349 * A181351 A181352 A181353

Keyword

nonn,easy

Author

Wolfdieter Lang, Oct 15 2010

Status

approved