A128151 A002260 * A097806.

1, 3, 2, 3, 5, 3, 3, 5, 7, 4, 3, 5, 7, 9, 5, 3, 5, 7, 9, 11, 6, 3, 5, 7, 9, 11, 13, 7, 3, 5, 7, 9, 11, 13, 15, 8, 3, 5, 7, 9, 11, 13, 15, 17, 9, 3, 5, 7, 9, 11, 13, 15, 17, 19, 10

Offset

1,2

Comments

Row sums = A028387: (1, 5, 11, 19, 29, 41, ...).

Links

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

Formula

A002260 * A097806 as infinite lower triangular matrices. a(1) = 1; n-th row has (n-1) terms in the sequence (3, 5, 7, 9, ...) followed by "n".

Example

First few rows of the triangle:
  1;
  3, 2;
  3, 5, 3;
  3, 5, 7, 4;
  3, 5, 7, 9, 5;
  ...

Crossrefs

Cf. A002260, A097806, A028387.

Sequence in context: A112427 A098229 A346388 * A071166 A140358 A130727

Adjacent sequences: A128148 A128149 A128150 * A128152 A128153 A128154

Keyword

nonn,tabl

Author

Gary W. Adamson, Feb 16 2007

Status

approved