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 A231021 Number of (n+3)X(4+3) 0..3 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero 1
 314, 10534, 85196, 3160834, 22328204, 859128648, 6209914254, 235891268252, 1699524352562, 64719602281334, 466469474405852, 17757501795145746, 127984378310902748, 4872242085182488788, 35115886181142148294 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A231023 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 R. H. Hardin, Empirical recurrence of order 70 FORMULA Empirical recurrence of order 70 (see link above) EXAMPLE Some solutions for n=2 ..x..0..x..0..x..0..x....x..0..x..0..x..2..x....x..0..x..2..x..2..x ..1..x..3..x..1..x..3....3..x..1..x..3..x..3....0..x..1..x..3..x..3 ..x..2..x..2..x..1..x....x..0..x..2..x..0..x....x..1..x..2..x..0..x ..1..x..1..x..0..x..2....3..x..1..x..1..x..3....2..x..0..x..1..x..3 ..x..0..x..0..x..3..x....x..0..x..0..x..2..x....x..3..x..0..x..0..x CROSSREFS Sequence in context: A230945 A183691 A284078 * A104819 A283901 A207148 Adjacent sequences:  A231018 A231019 A231020 * A231022 A231023 A231024 KEYWORD nonn AUTHOR R. H. Hardin, Nov 03 2013 STATUS approved

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Last modified May 26 17:17 EDT 2019. Contains 323597 sequences. (Running on oeis4.)