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 A256735 T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with no 3x3 subblock diagonal sum zero and no antidiagonal sum three 9
 384, 2304, 2304, 13056, 21904, 13056, 73984, 186624, 186624, 73984, 413440, 1648656, 2267136, 1648656, 413440, 2310400, 14137600, 30294016, 30294016, 14137600, 2310400, 12865280, 122323600, 388595712, 635846656, 388595712 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ........384.........2304...........13056.............73984..............413440 .......2304........21904..........186624...........1648656............14137600 ......13056.......186624.........2267136..........30294016...........388595712 ......73984......1648656........30294016.........635846656.........12465275904 .....413440.....14137600.......388595712.......12465275904........369798053888 ....2310400....122323600......5101387776......249872016384......11265313555456 ...12865280...1047687424.....65927512064.....4910514177024.....337855448236032 ...71639296...9002973456....859759181824....97652975330304...10232633445990400 ..398552832..77177284864..11156772618240..1928407075431424..307652425443164160 .2217279744.662446232464.145188233150464.38241122864997376.9286825801707749376 LINKS R. H. Hardin, Table of n, a(n) for n = 1..337 FORMULA Empirical for column k: k=1: a(n) = 7*a(n-1) -56*a(n-3) +64*a(n-4) k=2: [order 15] k=3: [order 16] k=4: [order 78] for n>80 EXAMPLE Some solutions for n=2 k=4 ..0..0..0..0..1..1....0..0..0..1..0..0....0..0..0..1..0..0....0..0..0..0..0..1 ..1..0..1..0..0..1....1..0..1..0..0..1....1..1..0..1..0..0....0..0..1..0..1..1 ..0..0..1..0..1..1....1..0..1..1..1..0....1..0..0..1..0..1....0..1..1..0..1..1 ..0..0..1..0..1..1....0..0..1..0..1..0....0..0..0..0..0..1....0..1..0..0..0..0 CROSSREFS Sequence in context: A212430 A134175 A233886 * A256728 A236029 A252904 Adjacent sequences: A256732 A256733 A256734 * A256736 A256737 A256738 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Apr 09 2015 STATUS approved

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Last modified November 28 14:28 EST 2023. Contains 367419 sequences. (Running on oeis4.)