A222604 Number of nX1 0..3 arrays with exactly floor(nX1/2) elements equal to at least one king-move neighbor, with new values introduced in row major 0..3 order

1, 0, 0, 6, 20, 20, 70, 685, 2808, 5370, 21294, 123410, 514792, 1341616, 5472216, 25106526, 105042770, 321557310, 1329068686, 5447475968, 22826820144, 76079350800, 316839140020, 1228204709225, 5153985361728, 17971182592538

Offset

1,4

Comments

Column 1 of A222608

Links

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

Crossrefs

Sequence in context: A007253 A096897 A063601 * A112809 A289659 A237043

Adjacent sequences: A222601 A222602 A222603 * A222605 A222606 A222607

Keyword

nonn

Author

R. H. Hardin Feb 26 2013

Status

approved