A232157 Number of nX4 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, vertically or antidiagonally, and no adjacent values equal.
8, 218, 1284, 7770, 46702, 286770, 1767266, 10830650, 66701686, 410364610, 2522566124, 15524673872, 95489164864, 587352257166, 3613537440642, 22227593479382, 136734516680534, 841147631122416, 5174280907720634
Offset: 1
Keywords
Examples
Some solutions for n=5 ..1..3..2..3....1..3..2..1....3..0..1..3....1..3..0..2....0..3..1..2 ..2..0..1..2....2..1..3..0....1..2..0..1....2..1..3..1....1..2..0..3 ..1..3..0..1....3..0..2..1....3..1..3..2....0..2..0..3....3..1..2..1 ..2..1..2..0....2..1..0..3....2..0..1..3....1..3..2..1....2..0..3..2 ..0..3..1..3....0..3..1..2....3..2..0..2....0..1..3..2....1..2..0..1
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
- R. H. Hardin, Empirical recurrence of order 94
Formula
Empirical recurrence of order 94 (see link above)
Comments