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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.

A302093 a(n) = floor(C(n/2)*C(n/2+1)), where C = Catalan numbers (A000108).

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 10
5 25
6 70
7 199
8 588
9 1784
10 5544
11 17569
12 56628
13 185202
14 613470
15 2054998
16 6952660
17 23732911
18 81662152
19 283026021
20 987369656
21 3465222945
22 12228193432
23 43369190282
24 154532114800
25 552998717472
26 1986841476000
27 7164993393905
28 25928281261800
29 94132464529902

List of values

[1, 1, 2, 4, 10, 25, 70, 199, 588, 1784, 5544, 17569, 56628, 185202, 613470, 2054998, 6952660, 23732911, 81662152, 283026021, 987369656, 3465222945, 12228193432, 43369190282, 154532114800, 552998717472, 1986841476000, 7164993393905, 25928281261800, 94132464529902]

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

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