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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.

A243421 Number of Dyck paths of semilength n having exactly 9 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).

Table of values

n a(n)
20 1
21 21
22 279
23 2914
24 25771
25 201454
26 1433041
27 9469739
28 59016909
29 350829247
30 2006522229
31 11114963598
32 59942608977
33 316006164419
34 1633786190804
35 8305527032158
36 41603804525306
37 205707814621939
38 1005426524364506
39 4863626362504773
40 23309223454202475
41 110773290856066906

List of values

[1, 21, 279, 2914, 25771, 201454, 1433041, 9469739, 59016909, 350829247, 2006522229, 11114963598, 59942608977, 316006164419, 1633786190804, 8305527032158, 41603804525306, 205707814621939, 1005426524364506, 4863626362504773, 23309223454202475, 110773290856066906]

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

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