cp's OEIS Frontend

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.

A239453 Convolution of the generalized Catalan numbers A057977 with themselves.

Table of values

n a(n)
0 1
1 2
2 3
3 8
4 11
5 30
6 43
7 112
8 172
9 420
10 694
11 1584
12 2809
13 6006
14 11379
15 22880
16 46088
17 87516
18 186562
19 335920
20 754646
21 1293292
22 3050238
23 4992288
24 12319816
25 19315400
26 49725004
27 74884320
28 200571541
29 290845350
30 808559299
31 1131445440
32 3257808976
33 4407922860
34 13119940234

List of values

[1, 2, 3, 8, 11, 30, 43, 112, 172, 420, 694, 1584, 2809, 6006, 11379, 22880, 46088, 87516, 186562, 335920, 754646, 1293292, 3050238, 4992288, 12319816, 19315400, 49725004, 74884320, 200571541, 290845350, 808559299, 1131445440, 3257808976, 4407922860, 13119940234]

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

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