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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.

A334719 a(n) is the total number of down-steps after the final up-step in all 4-Dyck paths of length 5*n (n up-steps and 4*n down-steps).

Table of values

n a(n)
0 0
1 4
2 30
3 250
4 2245
5 21221
6 208129
7 2098565
8 21619910
9 226593015
10 2408424760
11 25899375645
12 281273231985
13 3080585212120
14 33986840371400
15 377364606387005
16 4213620859310140
17 47284625533425750
18 532996618440511710
19 6032169040263819485
20 68517222947120776290

List of values

[0, 4, 30, 250, 2245, 21221, 208129, 2098565, 21619910, 226593015, 2408424760, 25899375645, 281273231985, 3080585212120, 33986840371400, 377364606387005, 4213620859310140, 47284625533425750, 532996618440511710, 6032169040263819485, 68517222947120776290]

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

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