A271678 Number of ways to move elements of an n X n X n triangular array to themselves or a neighbor, with no more than 2-1 elements moved to themselves.

1, 5, 22, 532, 19448, 2249488, 556148184, 357523207792, 546128923805904, 2069530459322561760, 19127220928721943633120

Offset

1,2

Comments

Column 2 of A271684.

Links

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

Example

Some solutions for n=4
.....5........0........5........6........0........5........5........5
....4.1......4.6......5.1......2.5......4.3......2.5......2.5......4.1
...5.3.3....5.1.6....4.6.1....2.4.6....5.5.3....6.3.1....6.2.5....6.0.5
..4.4.4.1..2.2.3.3..4.3.4.1..0.1.3.3..2.4.4.1..0.4.4.1..2.3.2.0..2.3.4.1
Element moves: 0=itself 1=nw 2=ne 3=w 4=e 5=sw 6=se, reciprocals total 7.

Crossrefs

Cf. A271684.

Sequence in context: A298322 A299215 A300031 * A002069 A298233 A215742

Adjacent sequences: A271675 A271676 A271677 * A271679 A271680 A271681

Keyword

nonn

Author

R. H. Hardin, Apr 12 2016

Status

approved