A131254 A004070 * A000012.

1, 2, 1, 4, 3, 1, 7, 6, 4, 1, 12, 11, 9, 5, 1, 20, 19, 17, 13, 6, 1, 33, 32, 30, 26, 18, 7, 1, 54, 53, 51, 47, 39, 24, 8, 1, 88, 87, 85, 81, 73, 57, 31, 9, 1, 143, 142, 140, 136, 128, 112, 81, 39, 10, 1

Offset

0,2

Comments

Left column = A000071, (Fibonacci numbers - 1) starting with F(3): (1, 2, 4, 7, 12, 20, ...).

Links

Table of n, a(n) for n=0..54.

Formula

A004070 * A000012 as infinite lower triangular matrices. Partial row sums of A004070 starting from the right.

Example

First few rows of the triangle:
   1;
   2,  1;
   4,  3,  1;
   7,  6,  4,  1;
  12, 11,  9,  5,  1;
  20, 19, 17, 13,  6,  1;
  33, 32, 30, 26, 18,  7,  1;
  ...
Row 3 = (7, 6, 4, 1) = partial sums starting from the right of (1, 2, 3, 1), being row 3 of A004070.

Crossrefs

Cf. A004070, A000012, A000071.

Sequence in context: A131252 A345123 A133805 * A210229 A210213 A305695

Adjacent sequences: A131251 A131252 A131253 * A131255 A131256 A131257

Keyword

nonn,tabl

Author

Gary W. Adamson, Jun 23 2007

Status

approved