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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A250585 Number of (n+1) X (1+1) 0..2 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction. 1
 40, 167, 639, 2375, 8625, 30952, 110187, 390391, 1378890, 4860979, 17115235, 60214730, 211741401, 744338632, 2616055529, 9193203944, 32303585679, 113504084395, 398802149195, 1401180399346, 4922940442496, 17296221980468 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 6*a(n-1) - 7*a(n-2) - 12*a(n-3) + 21*a(n-4) + 3*a(n-5) - 15*a(n-6) + 3*a(n-7) + 3*a(n-8) - a(n-9). Empirical g.f.: x*(40 - 73*x - 83*x^2 + 190*x^3 + 12*x^4 - 132*x^5 + 30*x^6 + 26*x^7 - 9*x^8) / ((1 - x)*(1 - 2*x - x^2 + x^3)*(1 - 3*x - 3*x^2 + 4*x^3 + x^4 - x^5)). - Colin Barker, Nov 15 2018 EXAMPLE Some solutions for n=6: ..0..0....1..1....1..1....1..1....1..2....1..1....0..2....1..1....1..2....1..0 ..2..1....0..1....0..2....0..1....2..1....0..1....1..2....0..2....2..2....0..1 ..1..2....1..1....2..2....0..1....1..2....0..2....0..2....1..2....0..2....0..1 ..0..2....2..1....0..2....1..2....2..1....1..2....0..2....2..1....0..2....1..0 ..2..2....1..2....2..1....2..1....0..2....2..2....1..2....1..2....2..1....0..1 ..2..2....0..2....1..2....0..2....2..2....0..2....2..2....1..2....0..2....1..1 ..1..2....2..0....0..2....2..2....0..2....2..0....0..2....2..1....2..1....1..1 CROSSREFS Column 1 of A250592. Sequence in context: A146762 A190073 A250592 * A260169 A205249 A211155 Adjacent sequences: A250582 A250583 A250584 * A250586 A250587 A250588 KEYWORD nonn AUTHOR R. H. Hardin, Nov 25 2014 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 September 16 04:06 EDT 2024. Contains 375959 sequences. (Running on oeis4.)