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.

A243420 Number of Dyck paths of semilength n having exactly 8 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).

Table of values

n a(n)
18 1
19 19
20 229
21 2184
22 17759
23 128509
24 851831
25 5278129
26 31020976
27 174803309
28 952033480
29 5042006351
30 26087126992
31 132340281386
32 660143136637
33 3245280843311
34 15751929981822
35 75602686035094
36 359256881535197
37 1691965976395069
38 7904617778358794
39 36660673151053000

List of values

[1, 19, 229, 2184, 17759, 128509, 851831, 5278129, 31020976, 174803309, 952033480, 5042006351, 26087126992, 132340281386, 660143136637, 3245280843311, 15751929981822, 75602686035094, 359256881535197, 1691965976395069, 7904617778358794, 36660673151053000]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.