A132778 Triangle read by rows, n-1 terms of (2n - 1) followed by n.

1, 3, 2, 5, 5, 3, 7, 7, 7, 4, 9, 9, 9, 9, 5, 11, 11, 11, 11, 11, 6, 13, 13, 13, 13, 13, 13, 7, 15, 15, 15, 15, 15, 15, 15, 8, 17, 17, 17, 17, 17, 17, 17, 17, 9, 19, 19, 19, 19, 19, 19, 19, 19, 19, 10, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 11, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 12

Offset

1,2

Comments

Row sums = A001844: (1, 5, 13, 25, 41, 61, ...).

Links

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

Formula

A007318^(-1) * [A003506 * A000012], as infinite lower triangular matrices.

Example

First few rows of the triangle:
  1;
  3, 2;
  5, 5, 3;
  7, 7, 7, 4;
  9, 9, 9, 9, 5;
  ...

Crossrefs

Cf. A001844, A003506, A007318.

Sequence in context: A124732 A167552 A094787 * A182289 A127738 A350900

Adjacent sequences: A132775 A132776 A132777 * A132779 A132780 A132781

Keyword

nonn,tabl

Author

Gary W. Adamson, Aug 29 2007

Extensions

Spurious extra term after a(44) deleted and more terms from Georg Fischer, Jun 02 2023

Status

approved