A127780 A127775 * A002260 as infinite lower triangular matrices.

1, 3, 6, 5, 10, 15, 7, 14, 21, 28, 9, 18, 27, 36, 45, 11, 22, 33, 44, 55, 66, 13, 26, 39, 52, 65, 78, 91, 15, 30, 45, 60, 75, 90, 105, 120

Offset

1,2

Comments

Odd number transform of A002260.

Row sums = A002414: (1, 9, 30, 70, 135, ...).

Links

Table of n, a(n) for n=1..36.

Example

First few rows of the triangle:
   1;
   3,  6;
   5, 10, 15;
   7, 14, 21, 28;
   9, 18, 27, 36, 45;
  11, 22, 33, 44, 55, 66;
  ...

Crossrefs

Cf. A127775, A002260, A002414.

Sequence in context: A242239 A123089 A246978 * A350661 A118413 A295320

Adjacent sequences: A127777 A127778 A127779 * A127781 A127782 A127783

Keyword

nonn,tabl

Author

Gary W. Adamson, Jan 28 2007

Status

approved