A271846 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 2-1 elements moved to themselves.

1, 2, 8, 124, 2782, 168566, 21337480, 6300361544, 4140011051160, 6186584633824524

Offset

1,2

Comments

Column 2 of A271852.

Links

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

Example

Some solutions for n=4
.....5........6........5........5........0........5........5........0
....4.1......2.3......4.1......4.1......4.5......4.1......4.1......5.3
...6.6.3....6.3.6....5.4.5....4.4.5....2.4.6....4.5.5....6.3.5....5.2.3
..2.3.4.1..0.2.2.3..4.1.1.0..2.3.3.0..2.3.3.3..0.1.4.1..0.2.4.1..4.4.4.1
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: A358152 A027530 A228064 * A009360 A202648 A193481

Adjacent sequences: A271843 A271844 A271845 * A271847 A271848 A271849

Keyword

nonn

Author

R. H. Hardin, Apr 15 2016

Status

approved