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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.

A234505 a(n) = 2*binomial(9*n+2,n)/(9*n+2).

Table of values

n a(n)
0 1
1 2
2 19
3 252
4 3885
5 65274
6 1159587
7 21421248
8 407337153
9 7920326700
10 156753610013
11 3147328992080
12 63951322669065
13 1312575792628356
14 27172514322677625
15 566707337222428800
16 11896007334177739113
17 251142622845893276190
18 5328891499524964282170

List of values

[1, 2, 19, 252, 3885, 65274, 1159587, 21421248, 407337153, 7920326700, 156753610013, 3147328992080, 63951322669065, 1312575792628356, 27172514322677625, 566707337222428800, 11896007334177739113, 251142622845893276190, 5328891499524964282170]

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

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