A131419 Central diagonal and left half of table A054225 which counts the partitions of n objects of 2 colors.

1, 1, 2, 2, 3, 4, 5, 7, 9, 7, 12, 16, 11, 19, 29, 31, 15, 30, 47, 57, 22, 45, 77, 97, 109, 30, 67, 118, 162, 189, 42, 97, 181, 257, 323, 339, 56, 139, 267, 401, 522, 589, 77, 195, 392, 608, 831, 975, 1043, 101, 272, 560, 907, 1279, 1576, 1752, 135, 373

Offset

0,3

Comments

Every diagonal appears in sequence A129306.

Links

Table of n, a(n) for n=0..57.

Example

Table A054225 begins
1
1...1
2...2...2
3...4...4...3
5...7...9...7...5
7..12..16..16..12..7
The diagonals in the new table begin
1..1..2..3..5...7...11...15...22...30..42 A000041
.....2..4..7..12...19...30...45...67..97 A000070
........9.16..29...47...77..118..181
..........31..57...97..162..257
.............109..189..323
..................339

Crossrefs

Cf. A108464, A129306.

Sequence in context: A326671 A134727 A152305 * A317177 A326491 A266748

Adjacent sequences: A131416 A131417 A131418 * A131420 A131421 A131422

Keyword

nonn,tabf

Author

Alford Arnold, Jul 11 2007

Extensions

More terms from R. J. Mathar, Sep 02 2007

Status

approved