cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

User: :ws:

:ws:'s wiki page.

:ws: has authored 2 sequences.

A033961 Number of different sets ("cut sets") of triangles a regular (n+2)-gon can be dissected into; two triangulations of an (n+2)-gon are equal if all numbers of congruent triangles coincide.

Original entry on oeis.org

1, 1, 2, 2, 4, 6, 11, 17, 35, 57, 115, 203, 412, 745, 1546, 2838, 5901, 11154, 23255, 44263, 93169, 179214, 377441, 733151, 1547068, 3020878, 6399874, 12543862
Offset: 2

Author

Heiko Harborth (i1031901(AT)ws.rz.tu-bs.de)

Keywords

References

  • Iuliana Dochkova-Todorova, Computer Methods and New Values for Cut Set Catalan Numbers, ICEST (2012), 206-207.
  • J. Dochkowa, H. Harborth and I. Mengersen, Cut set Catalan numbers, Congressus Numerantium, Proceedings of the Twenty-ninth Southeastern International Conference on Combinatorics, Graph Theory and Computing (Boca Raton, FL, 1998). Congr. Numer. 130 (1998), 133-139.

Extensions

a(20)-a(29) from Dochkova-Todorova added by Sean A. Irvine, Jul 26 2020

A033564 a(n+1) = concatenation of a(n) and a(n)+1, with a(0)=1.

Original entry on oeis.org

1, 12, 1213, 12131214, 1213121412131215, 12131214121312151213121412131216, 1213121412131215121312141213121612131214121312151213121412131217
Offset: 0

Author

Wolfgang Scheufele (ws(AT)pi3.informatik.uni-mannheim.de)

Keywords

Comments

The next term is too large to be included in the DATA section. - N. J. A. Sloane, Oct 20 2021

Programs

  • Mathematica
    NestList[FromDigits[Join[IntegerDigits[#],IntegerDigits[#+1]]]&,1,6] (* Jayanta Basu, May 20 2013 *)