A271962 Number of ways to move elements of an nXnXn triangular array to themselves or a neighbor, with no more than 1-1 2-cycles.

1, 3, 23, 445, 23145, 3135539, 1120710711, 1054066365149, 2612720914804105, 17070666122786078979, 294119848655438573724167

Offset

1,2

Comments

Column 1 of A271969.

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=4
.....5........0........0........6........5........6........5........0
....6.1......0.6......4.5......2.6......6.1......2.3......5.1......5.3
...5.6.1....0.2.6....2.6.0....2.5.6....6.6.1....5.3.6....5.4.1....6.2.6
..4.1.2.0..0.2.3.3..0.1.3.0..0.1.1.3..2.3.4.1..4.2.2.3..4.4.1.0..0.2.2.3
Element moves: 0=itself 1=nw 2=ne 3=w 4=e 5=sw 6=se, reciprocals total 7

Crossrefs

Cf. A271969.

Sequence in context: A298466 A358069 A116986 * A268668 A171777 A154896

Adjacent sequences: A271959 A271960 A271961 * A271963 A271964 A271965

Keyword

nonn

Author

R. H. Hardin, Apr 17 2016

Status

approved