A271680 Number of ways to move elements of an nXnXn triangular array to themselves or a neighbor, with no more than 4-1 elements moved to themselves.

1, 6, 51, 1564, 96249, 15313428, 5570048178, 4945752615088, 10408466809330388, 52893775837362904704

Offset

1,2

Comments

Column 4 of A271684.

Links

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

Example

Some solutions for n=4
.....0........6........0........0........0........0........6........0
....0.6......2.3......5.0......6.3......5.3......0.0......2.5......4.6
...5.2.5....0.4.5....5.1.6....5.3.1....4.2.6....5.6.6....6.1.5....5.1.3
..2.2.3.0..0.2.3.0..4.2.0.1..4.4.2.0..4.3.0.1..2.2.3.1..0.1.2.0..2.0.4.3
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: A337591 A125803 A197073 * A165896 A080265 A357428

Adjacent sequences: A271677 A271678 A271679 * A271681 A271682 A271683

Keyword

nonn

Author

R. H. Hardin, Apr 12 2016

Status

approved