A268055 Number of nX7 0..2 arrays with new values introduced in each row and column in sequential order starting with zero.

1, 64, 10438, 2796826, 915745002, 322124540754, 116124404018058, 42209510913723266, 15385058360607977882, 5612935794998414602514, 2048403161005485984441578, 747628311641175955079078306

Offset

1,2

Comments

Column 7 of A268056.

Links

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

Formula

Empirical: a(n) = 549*a(n-1) -75693*a(n-2) +3237331*a(n-3) -45379926*a(n-4) +206208420*a(n-5) -255602200*a(n-6)

Example

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

Crossrefs

Cf. A268056.

Sequence in context: A254607 A236690 A362541 * A268078 A202548 A374886

Adjacent sequences: A268052 A268053 A268054 * A268056 A268057 A268058

Keyword

nonn

Author

R. H. Hardin, Jan 25 2016

Status

approved