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 A187408 T(n,k)=Number of (n+1)X(n+1) 0..k arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum 7
 4, 9, 20, 16, 141, 152, 25, 580, 4743, 1984, 36, 1751, 59008, 378999, 50176, 49, 4332, 426425, 18555136, 77470101, 2677760, 64, 9331, 2164680, 397056235, 19210448896, 43182942669, 306864128, 81, 18152, 8583967, 4935992256, 1500716036725 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts .................4......................9......................16 ................20....................141.....................580 ...............152...................4743...................59008 ..............1984.................378999................18555136 .............50176...............77470101.............19210448896 ...........2677760............43182942669..........68711440384000 .........306864128.........69704886620367......884085911344119808 .......73913860096.....343603587128867631.42474221110291056295936 ....36612251582464.5351921330163734358189 .36818799747399680 LINKS R. H. Hardin, Table of n, a(n) for n = 1..61 EXAMPLE Some k=3 solutions for 4X4 ..0..2..3..0....0..2..2..2....0..0..3..0....0..1..2..0....0..3..0..1 ..3..0..2..2....1..0..2..1....1..0..2..2....2..0..1..3....3..0..2..1 ..2..2..0..2....3..2..0..0....1..3..0..3....1..1..0..0....1..1..0..0 ..2..1..3..0....2..0..1..0....2..1..3..0....1..3..0..0....2..0..2..0 CROSSREFS Sequence in context: A359278 A241351 A023377 * A211055 A336025 A308482 Adjacent sequences: A187405 A187406 A187407 * A187409 A187410 A187411 KEYWORD nonn,tabl AUTHOR R. H. Hardin Mar 09 2011 STATUS approved

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Last modified February 22 16:01 EST 2024. Contains 370256 sequences. (Running on oeis4.)