A163738 Number of n X 7 binary arrays with all 1s connected, all corners 1, and no 1 having more than two 1s adjacent.

1, 10, 95, 299, 1200, 5766, 39682, 280496, 1820644, 10879878, 62550967, 357472789, 2055055682, 11843175126, 67976484294, 387491768734, 2195341970660, 12383555646056, 69627977136961, 390355048862761, 2182125328996962, 12163963999818632, 67628630183657612, 375099014145565218

Offset

1,2

Links

Andrew Howroyd, Table of n, a(n) for n = 1..200

Example

All solutions for n=2:
...1.0.0.0.0.0.1...1.1.1.0.0.0.1...1.1.1.1.0.0.1...1.1.1.1.1.0.1
...1.1.1.1.1.1.1...1.0.1.1.1.1.1...1.0.0.1.1.1.1...1.0.0.0.1.1.1
------
...1.1.1.1.1.1.1...1.0.1.1.1.0.1...1.0.0.0.1.1.1...1.0.0.1.1.1.1
...1.0.0.0.0.0.1...1.1.1.0.1.1.1...1.1.1.1.1.0.1...1.1.1.1.0.0.1
------
...1.0.1.1.1.1.1...1.1.1.0.1.1.1
...1.1.1.0.0.0.1...1.0.1.1.1.0.1

Crossrefs

Row 7 of A391819.

Sequence in context: A190988 A287830 A259289 * A190987 A233738 A277441

Adjacent sequences: A163735 A163736 A163737 * A163739 A163740 A163741

Keyword

nonn

Author

R. H. Hardin, Aug 03 2009

Extensions

a(8) onward from Andrew Howroyd, Dec 21 2025

Status

approved