A132119 A002260 + A000027 - A000012 as infinite lower triangular matrices.

1, 3, 3, 6, 5, 6, 10, 8, 9, 10, 15, 12, 13, 14, 15, 21, 17, 18, 19, 20, 21, 28, 23, 24, 25, 26, 27, 28, 36, 30, 31, 32, 33, 34, 35, 36, 45, 38, 39, 40, 41, 42, 43, 44, 45, 55, 47, 48, 49, 50, 51, 52, 53, 54, 55

Offset

1,2

Comments

Row sums = A132127: (1, 6, 17, 37, 69, 116, ...).

Links

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

Example

First few rows of the triangle:
   1;
   3,  3;
   6,  5,  6;
  10,  8,  9, 10;
  15, 12, 13, 14, 15;
  21, 17, 18, 19, 20, 21;
  ...

Crossrefs

Cf. A002260, A000027, A000012, A132127.

Sequence in context: A319619 A309001 A142149 * A180681 A286102 A023822

Adjacent sequences: A132116 A132117 A132118 * A132120 A132121 A132122

Keyword

nonn,tabl

Author

Gary W. Adamson, Aug 10 2007

Status

approved