A131901 2*A002024 - A131821.

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

Offset

1,2

Comments

Row sums = A084849: (1, 4, 11, 22, 37, ...).

Links

Table of n, a(n) for n=1..55.

Formula

2*A002024 - A131821 as infinite lower triangular matrices.

Example

First few rows of the triangle:
  1;
  2,  2;
  3,  5,  3;
  4,  7,  7,  4;
  5,  9,  9,  9,  5;
  6, 11, 11, 11, 11,  6;
  7, 13, 13, 13, 13, 13,  7;
  ...

Crossrefs

Cf. A002024, A131821, A084849.

Sequence in context: A317018 A072039 A204012 * A204000 A132071 A334923

Adjacent sequences: A131898 A131899 A131900 * A131902 A131903 A131904

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 26 2007

Status

approved