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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.

A243416 Number of Dyck paths of semilength n having exactly 4 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).

Table of values

n a(n)
10 1
11 11
12 79
13 474
14 2561
15 12937
16 62524
17 293146
18 1344602
19 6065734
20 27007870
21 118984043
22 519589872
23 2252141576
24 9699519424
25 41541816291
26 177048628294
27 751293699026
28 3175665502731
29 13376228005419
30 56162636663430
31 235124074987923
32 981718571224412
33 4088916793922566

List of values

[1, 11, 79, 474, 2561, 12937, 62524, 293146, 1344602, 6065734, 27007870, 118984043, 519589872, 2252141576, 9699519424, 41541816291, 177048628294, 751293699026, 3175665502731, 13376228005419, 56162636663430, 235124074987923, 981718571224412, 4088916793922566]

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

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