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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.

A334611 a(n) is the total number of down-steps after the final up-step in all 4_2-Dyck paths of length 5*n (n up-steps and 4*n down-steps).

Table of values

n a(n)
0 0
1 9
2 82
3 747
4 7065
5 69098
6 694272
7 7127865
8 74468546
9 789265125
10 8466019380
11 91736269053
12 1002710879409
13 11042713886256
14 122413333216960
15 1364880618458565
16 15296452128008100
17 172218124701600741
18 1946960139291303222
19 22092883135853433030
20 251545025683283255770

List of values

[0, 9, 82, 747, 7065, 69098, 694272, 7127865, 74468546, 789265125, 8466019380, 91736269053, 1002710879409, 11042713886256, 122413333216960, 1364880618458565, 15296452128008100, 172218124701600741, 1946960139291303222, 22092883135853433030, 251545025683283255770]

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

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