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A271963
Number of ways to move elements of an nXnXn triangular array to themselves or a neighbor, with no more than 2-1 2-cycles.
0
1, 6, 44, 1207, 74247, 12282848, 5228980482, 5803552280765, 16782493037010409, 126714630730645970274
OFFSET
1,2
COMMENTS
Column 2 of A271969.
EXAMPLE
Some solutions for n=4
.....0........0........0........0........5........5........0........5
....0.0......5.3......0.0......0.0......4.1......6.1......4.3......4.1
...0.5.3....4.5.1....0.0.0....0.5.0....5.0.6....0.2.5....5.3.0....0.0.0
..0.4.2.0..0.4.2.0..0.0.4.3..0.2.0.0..4.1.0.1..0.0.4.1..4.2.0.0..0.4.3.0
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: A295978 A194928 A267074 * A065783 A158460 A077672
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 17 2016
STATUS
approved