A271851 Number of ways to move elements of an nXnXn triangular array to themselves or a neighbor, with no 2-cycles and with no more than 7-1 elements moved to themselves.

1, 3, 23, 426, 21010, 2422412, 656536622, 403782014944, 553766164923422

Offset

1,2

Comments

Column 7 of A271852.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
.....0........6........5........5........6........6........5........0
....4.6......2.3......6.1......4.1......2.6......2.3......6.1......0.0
...2.0.5....0.4.5....6.3.1....6.4.5....2.5.6....4.5.5....0.2.5....6.4.5
..2.3.3.0..0.2.3.0..0.4.4.1..2.3.1.0..2.3.1.3..2.3.4.1..0.0.4.1..2.3.1.0
Element moves: 0=itself 1=nw 2=ne 3=w 4=e 5=sw 6=se, reciprocals total 7

Crossrefs

Cf. A271852.

Sequence in context: A280654 A118195 A055326 * A133338 A298466 A358069

Adjacent sequences: A271848 A271849 A271850 * A271852 A271853 A271854

Keyword

nonn

Author

R. H. Hardin, Apr 15 2016

Status

approved