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 A251491 T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements less than the minimum of its antidiagonal elements 8
 236, 3456, 3456, 50576, 186304, 50576, 740096, 10046784, 10046784, 740096, 10830016, 541815424, 1996407424, 541815424, 10830016, 158478336, 29219848960, 396684056960, 396684056960, 29219848960, 158478336, 2319053056 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ......236........3456..........50576.............740096..............10830016 .....3456......186304.......10046784..........541815424...........29219848960 ....50576....10046784.....1996407424.......396684056960........78819515764397 ...740096...541815424...396684056960....290403118046224....212595602301764864 .10830016.29219848960.78819515764397.212595602301764864.573419887491673696912 LINKS R. H. Hardin, Table of n, a(n) for n = 1..144 FORMULA Empirical for column k: k=1: a(n) = 16*a(n-1) -20*a(n-2) k=2: [order 7] k=3: [order 16] k=4: [order 48] EXAMPLE Some solutions for n=2 k=4 ..0..0..0..2..3....0..0..1..1..0....0..0..2..2..3....0..0..2..1..0 ..0..3..0..0..1....0..0..0..2..0....0..0..1..0..0....0..0..0..3..0 ..0..0..3..3..3....0..0..3..2..0....0..0..0..2..0....0..0..2..2..0 CROSSREFS Sequence in context: A259639 A334649 A233983 * A251484 A247475 A233166 Adjacent sequences: A251488 A251489 A251490 * A251492 A251493 A251494 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Dec 03 2014 STATUS approved

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Last modified December 7 18:04 EST 2023. Contains 367660 sequences. (Running on oeis4.)