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A140767 Triangle read by rows, X^n * [1,1,0,0,0,...] where X = a tridiagonal matrix with (1,1,1,...) in the main and subdiagonals and (1,0,1,0,1,...) in the subsubdiagonal. 0
1, 1, 1, 2, 2, 1, 3, 5, 2, 2, 1, 4, 9, 7, 9, 2, 2, 1, 5, 14, 16, 25, 11, 13, 2, 2, 1, 6, 20, 30, 55, 36, 49, 15, 17, 2, 2, 1, 7, 27, 50, 105, 91, 140, 64, 81, 19, 21, 2, 2, 1, 8, 35, 77, 182, 196, 336, 204, 285, 100, 121, 23, 25, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Row sums = odd-indexed Fibonacci numbers starting (2, 5, 13, 34, 89, ...).

LINKS

Table of n, a(n) for n=0..64.

EXAMPLE

First few rows of the triangle are:

  1, 1;

  1, 2,  2;

  1, 3,  5,  2,   2;

  1, 4,  9,  7,   9,  2,   2;

  1, 5, 14, 16,  25, 11,  13,  2,  2;

  1, 6, 20, 30,  55, 36,  49, 15, 17,  2,  2;

  1, 7, 27, 50, 105, 91, 140, 64, 81, 19, 21, 2, 2;

  ...

CROSSREFS

Sequence in context: A046752 A086350 A239830 * A060850 A208336 A038137

Adjacent sequences:  A140764 A140765 A140766 * A140768 A140769 A140770

KEYWORD

nonn,tabf

AUTHOR

Gary W. Adamson & Roger L. Bagula, May 28 2008

STATUS

approved

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Last modified December 1 16:29 EST 2021. Contains 349430 sequences. (Running on oeis4.)