A134390 Duplicate of A131416.

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

dead

Author

Gary W. Adamson, Oct 23 2007

Extensions

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

Status

approved