A265681 Number of 4Xn arrays containing n copies of 0..4-1 with no equal vertical or antidiagonal neighbors and new values introduced sequentially from 0.

1, 23, 632, 20592, 734400, 27705984, 1086831962, 43880429586, 1811403496610, 76104309064345, 3243585449869690, 139894941451780572, 6094362820563358094, 267775378869795256077, 11852898175993602480090, 528058236407010277514014

Offset

1,2

Comments

Row 4 of A265679.

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

Some solutions for n=4
..0..0..1..1....0..0..1..2....0..1..0..2....0..1..0..0....0..1..2..2
..2..3..3..0....3..2..3..0....3..3..1..1....2..3..1..1....3..3..0..0
..1..0..1..3....1..1..2..2....2..2..3..2....1..2..0..3....2..1..3..3
..2..3..2..2....3..0..3..1....3..0..1..0....3..3..2..2....0..2..1..1

Crossrefs

Cf. A265679.

Sequence in context: A202667 A129991 A374304 * A023295 A169596 A142553

Adjacent sequences: A265678 A265679 A265680 * A265682 A265683 A265684

Keyword

nonn

Author

R. H. Hardin, Dec 13 2015

Status

approved