The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A224369 Number of n X 3 0..2 arrays with rows unimodal and antidiagonals nondecreasing. 1
 22, 218, 1838, 15540, 132236, 1126072, 9588028, 81634704, 695055928, 5917866680, 50386093544, 428998916880, 3652596505952, 31099055733376, 264784589835472, 2254437550085472, 19194805371407680, 163429034985577568 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A224374. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 10*a(n-1) - 16*a(n-2) + 30*a(n-3) - 14*a(n-4) + 12*a(n-5). Empirical g.f.: 2*x*(1 + x + x^2)*(11 - 12*x + 6*x^2) / (1 - 10*x + 16*x^2 - 30*x^3 + 14*x^4 - 12*x^5). - Colin Barker, Aug 30 2018 EXAMPLE Some solutions for n=3: ..2..0..0....0..1..1....0..1..1....1..2..0....0..1..0....1..0..0....2..0..0 ..0..0..1....1..1..0....2..1..0....2..1..0....2..1..0....0..1..0....2..1..0 ..2..2..2....1..2..2....1..2..1....2..1..1....1..2..2....1..1..2....1..2..1 CROSSREFS Cf. A224374. Sequence in context: A223928 A224052 A224305 * A331882 A008453 A290362 Adjacent sequences: A224366 A224367 A224368 * A224370 A224371 A224372 KEYWORD nonn AUTHOR R. H. Hardin, Apr 05 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 15 00:19 EDT 2024. Contains 375171 sequences. (Running on oeis4.)