A271847 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 3-1 elements moved to themselves.

1, 2, 14, 208, 6580, 471344, 72638356, 25380585434, 19661137065252, 34212157566464184

Offset

1,2

Comments

Column 3 of A271852.

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=4
.....6........6........5........0........0........6........6........5
....2.6......2.5......4.1......6.3......4.6......2.3......2.6......4.1
...4.1.5....2.6.0....5.3.3....5.6.1....5.1.6....4.4.6....5.1.3....5.0.5
..0.1.3.0..2.3.3.0..4.4.2.0..4.1.4.1..4.1.1.3..2.3.3.3..4.1.0.0..4.1.4.1
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: A122647 A158097 A262003 * A136550 A068369 A034405

Adjacent sequences: A271844 A271845 A271846 * A271848 A271849 A271850

Keyword

nonn

Author

R. H. Hardin, Apr 15 2016

Status

approved