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 A223860 Number of n X 4 0..3 arrays with rows and antidiagonals unimodal and columns nondecreasing. 1
 130, 3526, 41682, 315124, 1771012, 8008548, 30627033, 102479569, 307435001, 842078930, 2135465204, 5069027730, 11361881611, 24219158218, 49385314943, 96803565005, 183160193142, 335692581558, 597766839750, 1036890170376 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A223864. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = (3551/47900160)*n^12 + (3551/1995840)*n^11 + (100307/4354560)*n^10 + (28081/145152)*n^9 + (1559477/1451520)*n^8 + (14951/3456)*n^7 + (54414629/4354560)*n^6 + (18845069/725760)*n^5 + (41975947/1088640)*n^4 + (7155619/181440)*n^3 + (694249/83160)*n^2 - (7351/990)*n - 11 for n>1. EXAMPLE Some solutions for n=3 ..0..1..1..1....1..2..3..0....0..1..2..0....0..3..0..0....0..1..1..0 ..3..2..2..1....1..2..3..3....1..2..3..1....2..3..0..0....0..2..1..0 ..3..3..2..1....2..2..3..3....2..2..3..1....3..3..1..0....0..3..3..3 CROSSREFS Cf. A223864. Sequence in context: A228997 A168124 A224169 * A223983 A224060 A224046 Adjacent sequences: A223857 A223858 A223859 * A223861 A223862 A223863 KEYWORD nonn AUTHOR R. H. Hardin, Mar 28 2013 STATUS approved

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Last modified July 14 20:04 EDT 2024. Contains 374323 sequences. (Running on oeis4.)