A244367 Main diagonal of A244580.

1, 2, 4, 6, 6, 8, 9, 12, 12, 15, 15, 16, 18, 20, 20, 24, 24, 25, 28, 28, 30, 30, 32, 35, 35, 36, 40, 40, 42, 42, 45, 45, 48, 48, 49, 50, 54, 54, 56, 56, 60, 60, 63, 63, 64, 66, 66, 70, 70, 72, 72, 72, 77, 77, 80, 80, 81, 84, 84, 88, 88, 90, 90, 91, 91

Offset

1,2

Comments

a(n) is the number associated to the n-th cell of the main diagonal in the diagram of the symmetry of sigma. For more information see A237593 and A237270.

Records give A071562.

First differences are A259179. - Omar E. Pol, Apr 21 2020

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program for A244367

Example

Square array as in A244580:
.                         _ _ _ _ _ _ _ _ _
1,2,3,4,5,6,7,8,9...     |_| | | | | | | | |
2,2,3,4,5,6,7,8,9...     |_ _|_| | | | | | |
3,3,4,4,5,6,7,8,9...     |_ _|  _|_| | | | |
4,4,4,6,6,6,7,8,9...     |_ _ _|    _|_| | |
5,5,5,6,6,8,8,8,9...     |_ _ _|  _|  _ _|_|
6,6,6,6,8,8,9...         |_ _ _ _|  _| |
7,7,7,7,8,9,9...         |_ _ _ _| |_ _|
8,8,8,8,8...             |_ _ _ _ _|
9,9,9,9,9...             |_ _ _ _ _|
.

Prog

(PARI) See Links section.

Crossrefs

Cf. A000203, A071562, A196020, A236104, A237270, A237271, A237593, A240542, A244580, A259179.

Sequence in context: A235384 A342597 A035280 * A020887 A050827 A082990

Adjacent sequences: A244364 A244365 A244366 * A244368 A244369 A244370

Keyword

nonn

Author

Omar E. Pol, Jul 05 2014

Status

approved