A228660 -id:A228660 - cp's OEIS frontend

A228665 Number of 6 X n binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.

32, 70, 2348, 11912, 203762, 1482892, 19236832, 166237206, 1899605260, 17848767224, 192044287042, 1879682471996, 19647967583440, 196172283670342, 2022115572124828, 20385597248657864, 208716533500704978, 2114033802192686572, 21573650422984183744, 219011665920930992374

Offset: 1

R. H. Hardin, Aug 29 2013

			Some solutions for n=4:
..1..0..0..1....1..0..0..0....1..0..0..0....1..0..1..0....1..0..1..0
..0..0..0..1....0..0..1..0....0..0..0..0....1..0..1..0....0..0..0..0
..0..1..0..0....1..0..0..0....0..0..1..0....1..0..1..0....1..0..1..0
..0..0..0..0....0..0..0..1....1..0..1..0....1..0..0..0....0..0..0..0
..0..0..0..1....0..1..0..1....0..0..1..0....0..0..0..0....1..0..1..0
..0..1..0..1....0..1..0..0....1..0..0..0....0..0..0..0....0..0..0..0

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

Row 6 of A228660.

Empirical: a(n) = 4*a(n-1) +88*a(n-2) -138*a(n-3) -1388*a(n-4) +1332*a(n-5) +5911*a(n-6) -2920*a(n-7) -8340*a(n-8) +816*a(n-9) +2232*a(n-10).

A228666 Number of 7 X n binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.

Original entry on oeis.org

64, 169, 9598, 63688, 1720343, 17074988, 337258048, 4073313193, 69400592022, 925095934000, 14659747315671, 205401189207844, 3139657337791256, 45112454177593993, 677231112691330078, 9855259627789459448

Offset: 1

R. H. Hardin, Aug 29 2013

nonn

Row 7 of A228660.

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

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

Cf. A228660.

Empirical: a(n) = 9*a(n-1) +184*a(n-2) -1201*a(n-3) -7155*a(n-4) +46048*a(n-5) +70745*a(n-6) -591673*a(n-7) -154744*a(n-8) +3207657*a(n-9) -715173*a(n-10) -7580648*a(n-11) +3369552*a(n-12) +7114920*a(n-13) -3800952*a(n-14) -1923264*a(n-15) +1083456*a(n-16).

cp's OEIS Frontend

A228665 Number of 6 X n binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.

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