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 A203051 Number of nX2 0..5 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor 1
 6, 286, 7820, 177290, 4078368, 96511488, 2282090278, 53729637298, 1264907516536, 29797761325536, 701982503271882, 16535890993275488, 389515214599154626, 9175447823797074126, 216137962147112553480, 5091361932881161899850 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A203057 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 21*a(n-1) -50*a(n-2) +2261*a(n-3) +5179*a(n-4) +58301*a(n-5) +113102*a(n-6) +454821*a(n-7) +550157*a(n-8) +1071256*a(n-9) +600336*a(n-10) +518400*a(n-11) EXAMPLE Some solutions for n=5 ..1..2....2..4....1..1....5..1....0..2....4..5....0..5....5..0....0..3....2..1 ..3..5....2..4....1..5....5..2....2..3....5..5....0..5....5..5....1..5....2..1 ..3..5....3..0....0..5....2..1....4..3....2..2....1..0....2..1....2..5....0..2 ..2..5....3..3....5..3....0..5....4..2....3..0....4..5....1..4....4..0....0..3 ..0..2....1..0....5..1....1..5....3..2....4..4....3..5....4..4....5..5....2..3 CROSSREFS Sequence in context: A049679 A201139 A172660 * A128792 A340540 A027875 Adjacent sequences: A203048 A203049 A203050 * A203052 A203053 A203054 KEYWORD nonn AUTHOR R. H. Hardin Dec 28 2011 STATUS approved

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Last modified March 23 03:11 EDT 2023. Contains 361434 sequences. (Running on oeis4.)