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 A251983 T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not 0 1 2 7 8 or 9 and every diagonal and antidiagonal sum 0 1 2 7 8 or 9 9
 2930, 9822, 9822, 41682, 73222, 41682, 138390, 516108, 516108, 138390, 463054, 2703512, 4379034, 2703512, 463054, 1762248, 16324414, 26230040, 26230040, 16324414, 1762248, 6881308, 113817844, 196459816, 153525420, 196459816 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts .....2930.......9822........41682.......138390.........463054.........1762248 .....9822......73222.......516108......2703512.......16324414.......113817844 ....41682.....516108......4379034.....26230040......196459816......1645790820 ...138390....2703512.....26230040....153525420.....1175144274.....11222619848 ...463054...16324414....196459816...1175144274....10630171636....144374047558 ..1762248..113817844...1645790820..11222619848...144374047558...2806746475910 ..6881308..782954632..13277304274..98312125934..1633057450764..41357385753908 .25756230.5188534650.103969785600.803257677008.16362554029592.560931930325822 LINKS R. H. Hardin, Table of n, a(n) for n = 1..264 FORMULA Empirical for column k: k=1: [linear recurrence of order 31] for n>34 k=2: [order 47] for n>53 k=3: [order 56] for n>60 EXAMPLE Some solutions for n=2 k=4 ..0..3..0..3..0..1....0..3..0..2..1..3....0..3..0..3..0..3....0..3..1..2..0..1 ..3..0..3..0..3..0....3..0..3..0..3..1....3..0..3..0..3..1....3..0..3..0..3..0 ..0..3..0..3..1..2....0..3..0..3..0..2....1..2..0..3..0..1....1..2..0..3..0..3 ..2..0..2..1..2..1....2..2..2..1..1..2....2..2..2..0..2..1....2..1..2..0..3..0 CROSSREFS Sequence in context: A128149 A276671 A251233 * A251976 A251975 A252198 Adjacent sequences: A251980 A251981 A251982 * A251984 A251985 A251986 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Dec 12 2014 STATUS approved

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Last modified September 29 23:18 EDT 2023. Contains 365781 sequences. (Running on oeis4.)