A241116 Number of nX4 0..3 arrays with no element equal to exactly three horizontal or vertical neighbors, with new values 0..3 introduced in row major order.
15, 2614, 587555, 134229632, 30679522712, 7012241396116, 1602748583683541, 366331237082570675, 83730272300093086129, 19137757826895828304001, 4374209764040662469308200, 999788545392696494568265298
Offset: 1
Keywords
Examples
Some solutions for n=2 ..0..1..1..1....0..1..2..0....0..1..2..0....0..1..1..2....0..1..2..1 ..2..3..2..3....2..3..2..3....0..1..0..1....1..1..2..0....2..2..2..0
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
- R. H. Hardin, Empirical recurrence of order 74
Formula
Empirical recurrence of order 74 (see link above)
Comments