A192500 Half the number of nXnXn triangular binary arrays with every element unequal to at most 4 neighbors.

1, 4, 32, 456, 11296, 490296, 37306768, 4974819000, 1162617751768, 476177297334976, 341799731787300184, 429977139597378261384, 947959915554749042500496, 3662733300047294688846615504

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

Some solutions for 5X5X5 with a(1,1)=0
......0..........0..........0..........0..........0..........0..........0
.....0.1........0.0........0.0........1.0........1.1........0.0........0.0
....0.1.1......0.0.0......1.1.0......0.0.1......0.1.1......0.0.1......0.0.1
...0.0.1.0....1.1.1.1....1.1.0.1....1.0.0.1....1.1.1.1....0.0.0.1....1.0.0.0
..0.0.1.0.1..0.0.0.1.1..0.1.0.0.0..0.1.1.1.0..0.1.0.0.0..0.1.0.1.0..0.0.1.1.1

Crossrefs

Sequence in context: A005121 A327379 A214379 * A192486 A037964 A393536

Adjacent sequences: A192497 A192498 A192499 * A192501 A192502 A192503

Keyword

nonn

Author

R. H. Hardin, Jul 02 2011

Status

approved