A271683 Number of ways to move elements of an nXnXn triangular array to themselves or a neighbor, with no more than 7-1 elements moved to themselves.

1, 6, 61, 2230, 193950, 45502450, 25802403012, 35487976918328, 115589877888836347, 892600220580685825592

Offset

1,2

Comments

Column 7 of A271684.

Links

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

Example

Some solutions for n=4
.....0........0........0........5........6........6........0........6
....5.0......4.3......0.6......4.1......0.1......6.1......0.0......0.1
...2.0.6....4.5.6....6.0.1....4.5.0....5.6.3....6.1.5....6.3.5....6.3.0
..0.0.0.1..0.1.2.3..0.1.0.0..0.1.4.3..2.0.4.1..0.1.4.1..0.2.4.1..0.2.0.0
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: A275221 A243455 A271965 * A271966 A271967 A271968

Adjacent sequences: A271680 A271681 A271682 * A271684 A271685 A271686

Keyword

nonn

Author

R. H. Hardin, Apr 12 2016

Status

approved