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 A224375 Number of 3Xn 0..2 arrays with rows unimodal and antidiagonals nondecreasing 1
 27, 324, 1838, 7608, 26314, 80819, 227112, 593400, 1455898, 3378085, 7455007, 15725041, 31840088, 62123439, 117194882, 214407666, 381424761, 661365902, 1120086056, 1856304530, 3015496746, 4808693047, 7537606592, 11627841824 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A224374 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = (1/19160064)*n^12 + (1/456192)*n^11 + (2287/43545600)*n^10 + (215/290304)*n^9 + (20603/2903040)*n^8 + (923/17920)*n^7 + (14627101/43545600)*n^6 + (400091/207360)*n^5 + (16965289/2177280)*n^4 + (3069023/362880)*n^3 + (13912639/1663200)*n^2 + (21001/3465)*n - 6 EXAMPLE Some solutions for n=3 ..1..0..0....0..0..0....0..2..2....0..2..1....0..0..0....2..0..0....1..2..0 ..0..1..0....2..1..0....2..2..0....2..1..0....0..0..1....1..0..0....2..2..1 ..2..2..0....2..1..1....2..2..2....1..1..0....0..1..2....0..1..1....2..2..1 CROSSREFS Sequence in context: A231911 A182130 A224311 * A010832 A022719 A290405 Adjacent sequences: A224372 A224373 A224374 * A224376 A224377 A224378 KEYWORD nonn AUTHOR R. H. Hardin Apr 05 2013 STATUS approved

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Last modified July 21 15:35 EDT 2024. Contains 374474 sequences. (Running on oeis4.)