A131782 Triangle read by rows: (A004736 * A000012) + (A000012 * A004736) - A000012 as infinite lower triangular matrices.

1, 5, 1, 11, 5, 1, 19, 11, 5, 1, 29, 19, 11, 5, 1, 41, 29, 19, 11, 5, 1, 55, 41, 29, 19, 11, 5, 1, 71, 55, 41, 29, 19, 11, 5, 1, 89, 71, 55, 41, 29, 19, 11, 5, 1, 109, 89, 71, 55, 41, 29, 19, 11, 5, 1, 131, 109, 89, 71, 55, 41, 29, 19, 11, 5, 1, 155, 131, 109, 89, 71, 55, 41, 29, 19, 11, 5, 1

Offset

1,2

Comments

Row sums = A084990 starting (1, 6, 17, 36, 65, 106, ...).

Links

Table of n, a(n) for n=1..78.

Formula

n-th row = n descending terms of A028387: (1, 5, 11, 19, 29, 41, 55, ...). By columns, each column = A028387: (1, 5, 11, 19, 29, ...).

Example

First few rows of the triangle:
   1;
   5,  1;
  11,  5,  1;
  19, 11,  5,  1;
  29, 19, 11,  5,  1;
  41, 29, 19, 11,  5,  1;
  55, 41, 29, 19, 11,  5,  1;
  ...

Crossrefs

Cf. A004736, A028387, A084990.

Sequence in context: A296307 A238554 A067292 * A242060 A185953 A323359

Adjacent sequences: A131779 A131780 A131781 * A131783 A131784 A131785

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 14 2007

Extensions

Sign in definition and a(41) corrected; more terms from Georg Fischer, Jun 05 2023

Status

approved