A193833 Number of nXnXn triangular 0..3 arrays with no element equal to the sum or difference mod 4 of any two of its neighbors

4, 36, 77, 1089, 33123, 2098879, 268450093, 68719637953, 35184374010883, 36028797051155647, 73786976295548947437, 302231454903676253269793, 2475880078570761210896556355, 40564819207303340877897838038559

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

Some solutions for 4X4X4
.....2........1........2........2........2........2........2........1
....2.2......2.2......3.3......3.2......2.2......3.3......3.3......1.1
...2.2.2....2.2.2....3.2.2....2.3.3....3.3.2....3.2.2....2.2.2....4.4.1
..3.2.2.2..2.2.1.2..2.2.2.2..2.2.3.2..3.2.2.3..3.2.2.3..2.3.3.2..4.4.4.1

Crossrefs

Sequence in context: A167632 A072157 A075215 * A193183 A152760 A361719

Adjacent sequences: A193830 A193831 A193832 * A193834 A193835 A193836

Keyword

nonn

Author

R. H. Hardin Aug 06 2011

Status

approved