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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A250995 Number of (1+1) X (n+1) 0..2 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction. 1
 40, 169, 646, 2359, 8298, 28450, 95628, 316568, 1035294, 3352547, 10768211, 34351193, 108947285, 343813542, 1080310949, 3381653079, 10550153029, 32817177900, 101810982442, 315106120063, 973171192417, 2999712678334 (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) + 15*a(n-4) + 11*a(n-5) - 5*a(n-6) - 3*a(n-7). Empirical g.f.: x*(40 - 71*x - 88*x^2 + 146*x^3 + 94*x^4 - 48*x^5 - 27*x^6) / ((1 + x)*(1 - 3*x)*(1 - x - x^2)*(1 - 3*x + x^3)). - Colin Barker, Nov 24 2018 EXAMPLE Some solutions for n=4: 1 2 0 2 1 0 1 1 0 1 1 0 2 0 0 0 2 0 0 2 1 2 0 2 1 0 1 1 0 1 1 0 2 1 2 0 2 2 2 0 CROSSREFS Row 1 of A250994. Sequence in context: A205249 A211155 A250994 * A262487 A322774 A264547 Adjacent sequences: A250992 A250993 A250994 * A250996 A250997 A250998 KEYWORD nonn AUTHOR R. H. Hardin, Nov 29 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 June 8 01:59 EDT 2023. Contains 363157 sequences. (Running on oeis4.)