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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.

A300996 Total sum of half the difference between the area above and the area below the path, measured within the smallest enclosing rectangle based on the x-axis, in all Dyck paths of semilength n.

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 6
5 28
6 122
7 516
8 2142
9 8776
10 35630
11 143757
12 577548
13 2313400
14 9246556
15 36899291
16 147073062
17 585662952
18 2330527172
19 9268803248
20 36847836764
21 146441131058
22 581850689938
23 2311451765318
24 9181309423676
25 36466002547328
26 144826879361752
27 575173217031049

List of values

[0, 0, 0, 1, 6, 28, 122, 516, 2142, 8776, 35630, 143757, 577548, 2313400, 9246556, 36899291, 147073062, 585662952, 2330527172, 9268803248, 36847836764, 146441131058, 581850689938, 2311451765318, 9181309423676, 36466002547328, 144826879361752, 575173217031049]

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

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