A131783 A000012 * (A004736 + A002260 - I).

1, 4, 2, 8, 6, 3, 13, 11, 8, 4, 19, 17, 14, 10, 5, 26, 24, 21, 17, 12, 6, 34, 32, 29, 25, 20, 14, 7, 43, 41, 38, 34, 29, 23, 16, 8, 53, 51, 48, 44, 39, 33, 26, 18, 9, 64, 62, 59, 55, 50, 44, 37, 29, 20, 10

Offset

1,2

Comments

Left column = A034856: (1, 4, 8, 13, 19, ...).

Row sums = A084990: (1, 6, 17, 36, 65, 106, ...).

Links

Table of n, a(n) for n=1..55.

Formula

A000012 * (A004736 + A002260 - I), I = Identity matrix; A004736 = (1; 2,1; 3,2,1; ...); A002260 = (1; 1,2; 1,2,3; ...).

Example

First few rows of the triangle:
   1;
   4,  2;
   8,  6,  3;
  13, 11,  8,  4;
  19, 17, 14, 10,  5;
  26, 24, 21, 17, 12,  6;
  34, 32, 29, 25, 20, 14,  7;
  ...

Crossrefs

Cf. A004736, A002260, A034856, A084990.

Sequence in context: A367110 A339991 A098798 * A094312 A182848 A228834

Adjacent sequences: A131780 A131781 A131782 * A131784 A131785 A131786

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 14 2007

Status

approved