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 A252962 Number of (1+2)X(n+2) 0..4 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order 1
 60, 119, 223, 603, 1251, 3465, 7495, 20977, 46641, 130201, 295421, 819671, 1887977, 5198935, 12122019, 33114775, 78003575, 211448997, 502437547, 1352207165, 3237425013, 8655725461, 20860577041, 55443864307, 134398704589, 355316036899 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 1 of A252961 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = a(n-1) +9*a(n-2) -27*a(n-4) -55*a(n-5) +46*a(n-6) +157*a(n-7) +65*a(n-8) -168*a(n-9) -321*a(n-10) +123*a(n-11) +171*a(n-12) +198*a(n-13) -198*a(n-14) for n>16 EXAMPLE Some solutions for n=2 ..0..1..1..2....0..0..1..1....0..1..1..2....0..1..1..2....0..1..1..2 ..3..2..3..3....1..2..2..3....3..0..0..4....1..0..0..3....1..0..0..3 ..4..0..0..1....4..4..0..0....4..3..3..0....3..4..4..0....2..3..3..1 CROSSREFS Sequence in context: A174601 A306908 A252961 * A296767 A336442 A096490 Adjacent sequences:  A252959 A252960 A252961 * A252963 A252964 A252965 KEYWORD nonn AUTHOR R. H. Hardin, Dec 25 2014 STATUS approved

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Last modified January 27 09:04 EST 2022. Contains 350607 sequences. (Running on oeis4.)