A271965 Number of ways to move elements of an nXnXn triangular array to themselves or a neighbor, with no more than 4-1 2-cycles.

1, 6, 61, 2153, 177988, 39916412, 22826735465, 33845098700440, 129296551766864275, 1275025771457938799462

Offset

1,2

Comments

Column 4 of A271969.

Links

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

Example

Some solutions for n=4
.....0........6........6........6........6........0........0........5
....0.5......0.1......2.6......2.3......2.5......0.0......5.3......2.6
...5.2.5....6.0.6....2.3.3....6.0.0....5.1.5....0.4.5....4.4.1....6.2.5
..4.1.4.1..0.1.2.3..0.0.0.0..0.1.4.3..2.0.4.1..4.3.1.0..4.3.4.3..0.1.1.0
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: A022517 A275221 A243455 * A271683 A271966 A271967

Adjacent sequences: A271962 A271963 A271964 * A271966 A271967 A271968

Keyword

nonn

Author

R. H. Hardin, Apr 17 2016

Status

approved