A134390 (A000012 * A002260 + A002260 * A000012) - A000012.

1, 4, 3, 8, 8, 5, 13, 14, 12, 7, 19, 21, 20, 16, 9, 26, 29, 29, 26, 20, 11, 34, 38, 39, 37, 32, 24, 13, 43, 48, 50, 49, 45, 38, 28, 15, 53, 59, 62, 62, 59, 53, 44, 32, 17, 64, 71, 75, 76, 74, 69, 61, 50, 36, 19, 76, 84, 89, 91, 90, 86, 79, 69, 56, 40, 21, 89, 98, 104, 107, 107, 104, 98, 89, 77, 62, 44, 23

Offset

1,2

Comments

Row sums = A127736: (1, 7, 21, 46, 85, 141, 217, ...).

Links

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

Formula

(A000012 * A002260 + A002260 * A000012) - A000012 as infinite lower triangular matrices; where A000012 = (1; 1,1; 1,1,1; ...) and A002260 = (1; 1,2; 1,2,3; ...).

Example

First few rows of the triangle:
   1;
   4,  3;
   8,  8,  5;
  13, 14, 12,  7;
  19, 21, 20, 16,  9;
  26, 29, 29, 26, 20, 11;
  ...

Crossrefs

Cf. A002260, A127736.

Sequence in context: A196521 A021699 A131416 * A004125 A137924 A171527

Adjacent sequences: A134387 A134388 A134389 * A134391 A134392 A134393

Keyword

nonn,tabl

Author

Gary W. Adamson, Oct 23 2007

Extensions

a(6) corrected and more terms from Georg Fischer, Jun 05 2023

Status

approved