A127737 A002260 * A127701.

1, 3, 4, 3, 7, 9, 3, 7, 13, 16, 3, 7, 13, 21, 25, 3, 7, 13, 21, 31, 36, 3, 7, 13, 21, 31, 43, 49, 3, 7, 13, 21, 31, 43, 57, 64, 3, 7, 13, 21, 31, 43, 57, 73, 81, 3, 7, 13, 21, 31, 43, 57, 73, 91, 100

Offset

1,2

Comments

Deleting the right border (1, 4, 9, 16, ...), rows tend to A002061 starting (3, 7, 13, 21, 31, ...). Row sums = A108766: (1, 7, 19, 39, 69, 111, ...).

Links

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

Formula

A002260 * A127701 as infinite lower triangular matrices.

Example

First few rows of the triangle:
  1;
  3, 4;
  3, 7,  9;
  3, 7, 13, 16;
  3, 7, 13, 21, 25;
  ...

Crossrefs

Cf. A002260, A127701, A108766, A002061.

Sequence in context: A337493 A291317 A141730 * A358125 A299416 A333974

Adjacent sequences: A127734 A127735 A127736 * A127738 A127739 A127740

Keyword

nonn,tabl

Author

Gary W. Adamson, Jan 27 2007

Status

approved