A134868 A103451 * A002260.

1, 2, 2, 2, 2, 3, 2, 2, 3, 4, 2, 2, 3, 4, 5, 2, 2, 3, 4, 5, 6, 2, 2, 3, 4, 5, 6, 7, 2, 2, 3, 4, 5, 6, 7, 8, 2, 2, 3, 4, 5, 6, 7, 8, 9, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13

Offset

1,2

Comments

Row sums = A134869: (1, 4, 7, 11, 16, 22, 29, ...).

Links

Michael De Vlieger, Table of n, a(n) for n = 1..10000

Formula

A103451 * A002260 as infinite lower triangular matrices.

Left border of A002260, (1, 1, 1, 1, ...) is replaced by (1, 2, 2, 2, ...).

Example

First few rows of the triangle:
  1;
  2, 2;
  2, 2, 3;
  2, 2, 3, 4;
  2, 2, 3, 4, 5;
  ...

Mathematica

Table[k + Boole[k == 1 && n != 2], {n, 2, 14}, {k, n - 1}] // Flatten (* Michael De Vlieger, Jul 19 2016 *)

Crossrefs

Cf. A002260, A071324, A134869.

Sequence in context: A067595 A184721 A369705 * A322861 A237259 A235614

Adjacent sequences: A134865 A134866 A134867 * A134869 A134870 A134871

Keyword

nonn,tabl

Author

Gary W. Adamson, Nov 14 2007

Status

approved