A271682 Number of ways to move elements of an nXnXn triangular array to themselves or a neighbor, with no more than 6-1 elements moved to themselves.

1, 6, 60, 2113, 172410, 36413940, 18170233119, 21841947058888, 61988254011431753, 418314271755569289008

Offset

1,2

Comments

Column 6 of A271684.

Links

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

Example

Some solutions for n=4
.....5........5........6........0........0........5........5........6
....2.0......6.1......2.6......0.0......5.3......5.1......2.5......6.1
...5.0.6....6.4.1....4.1.6....5.4.3....6.0.1....6.4.1....0.2.0....5.1.5
..4.1.0.1..2.3.4.3..0.1.3.3..4.1.4.3..0.4.4.1..0.4.1.0..4.3.0.0..2.0.4.1
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: A271681 A010574 A363789 * A082681 A061431 A261523

Adjacent sequences: A271679 A271680 A271681 * A271683 A271684 A271685

Keyword

nonn

Author

R. H. Hardin, Apr 12 2016

Status

approved