A271966 Number of ways to move elements of an nXnXn triangular array to themselves or a neighbor, with no more than 5-1 2-cycles.

1, 6, 61, 2261, 202966, 50507975, 32409741782, 54228205133050, 234020864527611544, 2603842251429699490847

Offset

1,2

Comments

Column 5 of A271969.

Links

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

Example

Some solutions for n=4
.....0........6........6........5........5........0........5........0
....5.0......5.1......2.5......2.0......4.1......0.6......4.1......6.6
...2.0.0....4.1.5....0.1.0....4.5.6....0.6.3....6.2.3....6.4.3....2.2.5
..0.0.4.3..4.3.4.1..0.0.0.0..2.3.0.1..4.3.2.0..0.1.0.0..0.1.0.0..2.3.3.0
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: A243455 A271965 A271683 * A271967 A271968 A022502

Adjacent sequences: A271963 A271964 A271965 * A271967 A271968 A271969

Keyword

nonn

Author

R. H. Hardin, Apr 17 2016

Status

approved