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 A252806 Number of (n+2)X(3+2) 0..4 arrays with every consecutive three elements in every row and column not having exactly two distinct values, and in every diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order 1
 357, 488, 1337, 551, 2068, 6961, 2891, 10687, 35835, 15328, 56023, 186554, 81798, 294256, 971782, 438093, 1549042, 5068959, 2354313, 8172677, 26476065, 12695662, 43221349, 138494624, 68704164, 229160414, 725637116, 373152371, 1218327968 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A252811 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = a(n-1) +11*a(n-3) -11*a(n-4) -30*a(n-6) +30*a(n-7) -2*a(n-9) +2*a(n-10) +7*a(n-12) -7*a(n-13) -a(n-15) +a(n-16) for n>19 EXAMPLE Some solutions for n=2 ..0..1..2..0..3....0..1..2..3..1....0..1..2..3..1....0..1..2..3..4 ..4..3..1..4..0....1..0..2..1..0....2..2..2..2..2....4..0..2..4..0 ..2..0..3..2..4....2..2..2..2..2....1..3..2..1..4....2..2..2..2..2 ..1..4..0..1..2....4..1..2..0..1....3..4..2..3..1....3..4..2..0..1 CROSSREFS Sequence in context: A277765 A357775 A052479 * A252027 A241931 A166916 Adjacent sequences: A252803 A252804 A252805 * A252807 A252808 A252809 KEYWORD nonn AUTHOR R. H. Hardin, Dec 22 2014 STATUS approved

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Last modified December 2 17:31 EST 2023. Contains 367525 sequences. (Running on oeis4.)