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 A206396 T(n,k)=Number of nXk 0..5 arrays with no element equal to another within a city block distance of two, and new values 0..5 introduced in row major order 7
 1, 1, 1, 1, 1, 1, 2, 4, 4, 2, 5, 25, 26, 25, 5, 15, 172, 206, 206, 172, 15, 51, 1201, 1592, 1931, 1592, 1201, 51, 187, 8404, 12428, 16784, 16784, 12428, 8404, 187, 715, 58825, 96632, 151630, 170796, 151630, 96632, 58825, 715, 2795, 411772, 752552, 1343560 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 COMMENTS Table starts ...1.....1......1........2.........5.........15..........51..........187 ...1.....1......4.......25.......172.......1201........8404........58825 ...1.....4.....26......206......1592......12428.......96632.......752552 ...2....25....206.....1931.....16784.....151630.....1343560.....12046648 ...5...172...1592....16784....170796....1787258....18574298....193499878 ..15..1201..12428...151630...1787258...21983256...268956972...3301485294 ..51..8404..96632..1343560..18574298..268956972..3889732730..56960076094 .187.58825.752552.12046648.193499878.3301485294.56960076094.998388746378 LINKS R. H. Hardin, Table of n, a(n) for n = 1..127 EXAMPLE Some solutions for n=4 k=3 ..0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2 ..2..3..0....2..3..4....2..3..4....3..4..5....3..4..5....2..3..0....2..3..4 ..1..4..5....1..0..5....4..5..1....5..0..1....1..0..3....4..5..1....1..5..0 ..0..2..1....3..2..1....1..2..0....4..3..2....2..5..1....0..2..3....0..2..3 CROSSREFS Column 1 is A007581(n-3) Column 2 is A034494(n-2) Sequence in context: A234247 A160163 A263442 * A206389 A206503 A323938 Adjacent sequences: A206393 A206394 A206395 * A206397 A206398 A206399 KEYWORD nonn,tabl AUTHOR R. H. Hardin Feb 07 2012 STATUS approved

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Last modified December 2 13:30 EST 2023. Contains 367524 sequences. (Running on oeis4.)