A239642 Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4

2, 20, 1182, 320314, 471203608, 3608789598890, 144633234041629586, 30422021680410630610470, 33561342025910573963641656948

Offset

1,1

Comments

Diagonal of A239649

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=3
..1..0..0....1..0..0....1..3..3....3..0..0....3..0..0....3..0..0....1..0..3
..1..3..1....2..1..0....2..3..2....2..1..1....2..0..3....2..3..3....1..0..0
..3..0..2....3..2..0....3..2..2....1..2..1....2..3..0....2..0..0....3..1..2

Crossrefs

Sequence in context: A012790 A273194 A013144 * A369679 A112359 A308231

Adjacent sequences: A239639 A239640 A239641 * A239643 A239644 A239645

Keyword

nonn

Author

R. H. Hardin, Mar 23 2014

Status

approved