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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.

A200312 a(n) = A000108(n)*A006130(n), where A000108 is the Catalan numbers and A006130(n) = A006130(n-1) + 3*A006130(n-2).

Table of values

n a(n)
0 1
1 1
2 8
3 35
4 266
5 1680
6 12804
7 93093
8 726440
9 5635058
10 45063668
11 362121760
12 2955642508
13 24284658100
14 201428123040
15 1680921310635
16 14119413718770
17 119205791509200
18 1011387051005100
19 8617021562542470
20 73704123363739440
21 632601537174078420

List of values

[1, 1, 8, 35, 266, 1680, 12804, 93093, 726440, 5635058, 45063668, 362121760, 2955642508, 24284658100, 201428123040, 1680921310635, 14119413718770, 119205791509200, 1011387051005100, 8617021562542470, 73704123363739440, 632601537174078420]

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

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