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 A240260 T(n,k)=Number of nXk 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4 8
 3, 7, 7, 16, 26, 16, 38, 102, 89, 38, 90, 429, 707, 342, 90, 212, 1814, 5610, 5484, 1362, 212, 500, 7576, 45436, 85567, 43200, 5447, 500, 1180, 31876, 368247, 1378558, 1350983, 343959, 21816, 1180, 2784, 134302, 2999288, 22319938, 43503375 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ....3.......7.........16..........38............90...........212...........500 ....7......26........102.........429..........1814..........7576.........31876 ...16......89........707........5610.........45436........368247.......2999288 ...38.....342.......5484.......85567.......1378558......22319938.....362690826 ...90....1362......43200.....1350983......43503375....1409359406...45804774819 ..212....5447.....343959....21525611....1386865953...89883497849.5842759733285 ..500...21816....2750576...344032061...44332944831.5748121725943 .1180...87527...22038291..5504564819.1418479860917 .2784..351510..176729972.88114108260 .6568.1412417.1417804827 LINKS R. H. Hardin, Table of n, a(n) for n = 1..81 FORMULA Empirical for column k: k=1: a(n) = 2*a(n-1) +2*a(n-3) k=2: [order 31] Empirical for row n: n=1: a(n) = 2*a(n-1) +2*a(n-3) n=2: [order 44] EXAMPLE Some solutions for n=4 k=4 ..2..0..0..0....0..2..2..0....0..2..2..2....0..2..0..2....2..2..2..2 ..0..0..0..0....0..0..2..2....2..0..2..0....0..0..2..0....0..0..0..2 ..0..0..0..0....2..2..2..2....2..2..0..0....2..0..2..2....2..0..2..2 ..2..0..0..0....0..2..2..0....0..2..2..2....0..0..0..0....0..0..0..0 CROSSREFS Column 1 and row 1 are A239040 Sequence in context: A130003 A098581 A238997 * A240427 A239047 A229521 Adjacent sequences: A240257 A240258 A240259 * A240261 A240262 A240263 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Apr 03 2014 STATUS approved

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Last modified March 23 17:34 EDT 2023. Contains 361449 sequences. (Running on oeis4.)