A222511 Number of 3Xn 0..1 arrays with exactly floor(3Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order

0, 4, 4, 15, 35, 170, 441, 2192, 5416, 26660, 66209, 328121, 816736, 4074688, 10172187, 51053330, 127212627, 643151980, 1598614930, 8135779154, 20183768037, 103256080822, 255983883834, 1314494576457, 3259213240495, 16780895442470

Offset

1,2

Comments

Row 3 of A222509

Links

R. H. Hardin, Table of n, a(n) for n = 1..77

Example

All solutions for n=3
..0..0..0....0..0..0....0..1..0....0..0..0
..1..0..0....0..0..1....1..1..1....0..0..0
..0..0..0....0..0..0....1..1..1....1..0..1

Crossrefs

Sequence in context: A068592 A198313 A219350 * A135944 A268169 A177241

Adjacent sequences: A222508 A222509 A222510 * A222512 A222513 A222514

Keyword

nonn

Author

R. H. Hardin Feb 23 2013

Status

approved