A231021 Number of (n+3)X(4+3) 0..3 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

314, 10534, 85196, 3160834, 22328204, 859128648, 6209914254, 235891268252, 1699524352562, 64719602281334, 466469474405852, 17757501795145746, 127984378310902748, 4872242085182488788, 35115886181142148294

Offset

1,1

Comments

Column 4 of A231023

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical recurrence of order 70

Formula

Empirical recurrence of order 70 (see link above)

Example

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

Crossrefs

Sequence in context: A230945 A183691 A284078 * A104819 A283901 A207148

Adjacent sequences: A231018 A231019 A231020 * A231022 A231023 A231024

Keyword

nonn

Author

R. H. Hardin, Nov 03 2013

Status

approved