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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A166197 Number of nXnXn triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 2 2
 1, 3, 1, 2, 6, 12, 26, 90, 200, 665, 3980, 10515, 52518, 433447, 1973317, 14252749, 166762668, 1065468116, 11148385916, 193707228525, 1758897674635, 26740845738267, 672553810724428, 9032785397690122, 199494539604910376 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS R. H. Hardin, Table of n, a(n) for n=0..27 EXAMPLE All solutions for n=4 .....0........1........1........0........2........0... ....0.0......0.0......0.0......0.0......0.0......0.0.. ...0.2.0....0.0.0....0.1.0....0.0.0....0.0.0....0.1.0. ..0.0.0.0..1.0.0.1..1.0.0.1..0.0.0.0..2.0.0.2..0.0.0.0 CROSSREFS Sequence in context: A201655 A049917 A308709 * A010279 A024743 A024963 Adjacent sequences: A166194 A166195 A166196 * A166198 A166199 A166200 KEYWORD nonn AUTHOR R. H. Hardin Oct 09 2009 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 February 3 23:01 EST 2023. Contains 360045 sequences. (Running on oeis4.)