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 A230943 Number of (n+3) X (2+3) 0..3 white 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
 16, 34, 724, 1994, 28128, 76682, 1144652, 3107746, 46058744, 125263570, 1857863476, 5050618938, 74908095984, 203655079130, 3020446141788, 8211674722322, 121789649054696, 331109620080930, 4910772371719684 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A230949. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 31*a(n-2) +375*a(n-4) +233*a(n-6) -7946*a(n-8) -884*a(n-10) -16296*a(n-12) -203520*a(n-14) +53120*a(n-16). EXAMPLE Some solutions for n=2: ..0..x..0..x..2....0..x..0..x..2....0..x..0..x..2....0..x..2..x..2 ..x..1..x..3..x....x..1..x..3..x....x..1..x..3..x....x..1..x..3..x ..0..x..2..x..0....2..x..2..x..2....0..x..2..x..2....0..x..0..x..2 ..x..3..x..1..x....x..3..x..1..x....x..1..x..1..x....x..3..x..3..x ..2..x..0..x..0....2..x..0..x..0....0..x..0..x..0....2..x..2..x..2 CROSSREFS Cf. A230949. Sequence in context: A185459 A279712 A228800 * A070589 A104910 A161441 Adjacent sequences: A230940 A230941 A230942 * A230944 A230945 A230946 KEYWORD nonn AUTHOR R. H. Hardin, Nov 01 2013 STATUS approved

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Last modified June 4 02:25 EDT 2023. Contains 363118 sequences. (Running on oeis4.)