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 A222666 T(n,k)=Number of nXk 0..3 arrays with exactly floor(nXk/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order 7
 1, 0, 0, 0, 0, 0, 3, 2, 2, 3, 4, 9, 2, 9, 4, 8, 26, 44, 44, 26, 8, 10, 103, 110, 452, 110, 103, 10, 55, 446, 2686, 4241, 4241, 2686, 446, 55, 72, 1964, 7624, 62406, 45666, 62406, 7624, 1964, 72, 294, 8624, 186400, 1058776, 2169240, 2169240, 1058776, 186400, 8624, 294 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 COMMENTS Table starts ....1......0.........0.............3..............4................8 ....0......0.........2.............9.............26..............103 ....0......2.........2............44............110.............2686 ....3......9........44...........452...........4241............62406 ....4.....26.......110..........4241..........45666..........2169240 ....8....103......2686.........62406........2169240.........85836756 ...10....446......7624.......1058776.......33001473.......4437593254 ...55...1964....186400......17374571.....2076266347.....258544501925 ...72...8624....568750.....288771291....33923371172...16020345244330 ..294..38467..13426930....4860565711..2217501880962.1025854594717790 ..378.172996..43148672...81668904553.36915666949865 .1883.781826.976797964.1371394427050 LINKS R. H. Hardin, Table of n, a(n) for n = 1..127 EXAMPLE Some solutions for n=3 k=4 ..0..0..0..1....0..0..0..0....0..0..0..0....0..0..1..1....0..0..0..1 ..0..0..0..0....1..0..0..0....0..0..0..1....0..0..1..1....0..0..1..1 ..0..0..0..1....1..0..0..0....0..0..2..1....0..0..1..1....0..0..1..1 CROSSREFS Column 1 is A222269 Sequence in context: A338241 A222456 A222673 * A335401 A324465 A334592 Adjacent sequences:  A222663 A222664 A222665 * A222667 A222668 A222669 KEYWORD nonn,tabl AUTHOR R. H. Hardin Feb 28 2013 STATUS approved

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Last modified November 27 20:49 EST 2021. Contains 349395 sequences. (Running on oeis4.)