A270057 Number of nX7 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.

30720, 414705720, 3230189811360, 21244602958557060, 128543872461556329960, 739963061540157663852060, 4120579270516550893026428880, 22408736961354610893755135234040, 119718109679183490800236571685026760

Offset

1,1

Comments

Column 7 of A270058.

Links

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

R. H. Hardin, Empirical recurrence of order 64

Formula

Empirical recurrence of order 64 (see link above)

Example

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

Crossrefs

Cf. A270058.

Sequence in context: A236126 A236944 A269828 * A236899 A258891 A237469

Adjacent sequences: A270054 A270055 A270056 * A270058 A270059 A270060

Keyword

nonn

Author

R. H. Hardin, Mar 09 2016

Status

approved