The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A307406 Number of twisted permutations of the nonnegative integers in base 2*n+1 with an adjacency diagram as defined by Knuth in A220952. 3
 1, 1, 5, 47 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS The concept of the adjacency diagram in A220952 is not limited to base 5, but can be investigated for all odd bases. In "base 1", the path consists of a single node (1,1). For base 3, there is the ternary Gray code A128173 only. A corresponding simple up-down pattern with a path (0,0), ... (0,n), (1,n), ... (1,0), (2,0), ... (n,n) can be constructed for any odd base. Conjecture: a(4) = 673. LINKS Table of n, a(n) for n=0..3. Georg Fischer, Repository of programs for related sequences, (gen_paths.pl) PROG (Perl) cf. link CROSSREFS Cf. A128173 (base 3, "n"), A220952 (Knuth, base 5, "Hn"), A307403 ("Hs"), A307404 ("Ln"), A307405 ("Ls"), A300857 (base 7). Sequence in context: A183240 A299715 A000872 * A060392 A196160 A136088 Adjacent sequences: A307403 A307404 A307405 * A307407 A307408 A307409 KEYWORD nonn,hard,more AUTHOR Georg Fischer, Apr 07 2019 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 May 26 16:22 EDT 2024. Contains 372840 sequences. (Running on oeis4.)