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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A201867 Number of zero-sum -2..2 arrays of n elements with first and second differences also in -2..2 1
 1, 3, 5, 19, 45, 129, 345, 1031, 2969, 8803, 25791, 76285, 225047, 667807, 1984599, 5918017, 17672419, 52880691, 158447783, 475463579, 1428412619, 4296219727, 12934516047, 38978330199, 117561661847, 354857238103, 1071910795169 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 2 of A201873 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 Wolfdieter Lang, On Generating functions of Diagonals Sequences of Sheffer and Riordan Number Triangles, arXiv:1708.01421 [math.NT], August 2017. EXAMPLE Some solutions for n=10 .-1....1...-1....2...-1...-1....1....2....2....0...-2...-2...-2....2...-2...-2 .-1....2...-2....2....0...-1....1....2....2...-1...-2...-2...-1....1....0...-2 ..1....1...-1....2...-1...-1....0....2....1....0...-1....0....0...-1....0....0 ..1....0....0....1...-1...-2...-1....0....1....2....0....2...-1...-2....1....0 ..0...-1....1....0...-1...-1...-1...-1...-1....2....0....2...-1...-2....1....0 .-1...-1....0....0....0....0....0....0...-1....1....0....0...-1....0....1....0 ..0....0....1...-2....0....1....1...-1....0....0....1...-1....1....1....1....0 ..0...-1....1...-2....1....2....0...-1....0...-2....1....0....2....0...-1....1 ..0....0....1...-2....2....2...-1...-1...-2...-2....1....0....1....1...-1....2 ..1...-1....0...-1....1....1....0...-2...-2....0....2....1....2....0....0....1 CROSSREFS Sequence in context: A218373 A034511 A133603 * A148534 A148535 A148536 Adjacent sequences: A201864 A201865 A201866 * A201868 A201869 A201870 KEYWORD nonn AUTHOR R. H. Hardin Dec 06 2011 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 29 23:48 EDT 2023. Contains 365781 sequences. (Running on oeis4.)