A193368 Number of nXnXn triangular 0..3 arrays with no element equal to the product mod 4 of any two neighbors.

4, 41, 358, 3136, 52618, 2219896, 180648122, 26186281114, 6817597592917, 3174584242587777, 2648093971605024584, 3954815147871186523991, 10576607847561078075619087, 50648631487657145850324740233

Offset

1,1

Links

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

Example

Some solutions for 4X4X4
.....2........2........2........3........2........1........2........2
....1.0......3.3......1.1......3.0......3.3......0.3......3.3......3.0
...2.3.1....3.0.3....3.0.3....3.3.2....3.3.2....2.1.2....2.3.2....3.3.3
..3.0.1.0..3.2.3.3..0.2.1.2..2.0.3.0..3.2.3.3..0.1.0.1..3.3.3.0..3.3.2.0

Crossrefs

Sequence in context: A089664 A121671 A089454 * A109109 A227996 A236528

Adjacent sequences: A193365 A193366 A193367 * A193369 A193370 A193371

Keyword

nonn

Author

R. H. Hardin, Jul 24 2011

Status

approved