A131922 Triangle read by rows: 2*A002024 - A130296 as infinite lower triangular matrices.

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

Offset

0,2

Comments

Row sums = A001844: (1, 5, 13, 25, 41, 61, 85, ...).

Links

Table of n, a(n) for n=0..77.

Example

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

Crossrefs

Cf. A001844, A002024, A130296.

Sequence in context: A193404 A072923 A257003 * A260718 A064631 A347293

Adjacent sequences: A131919 A131920 A131921 * A131923 A131924 A131925

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 29 2007

Extensions

Edited and more terms from Georg Fischer, Jun 08 2023

Status

approved