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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.

A050479 a(n) = C(n)*(9*n + 1) where C(n) = Catalan numbers (A000108).

Table of values

n a(n)
0 1
1 10
2 38
3 140
4 518
5 1932
6 7260
7 27456
8 104390
9 398684
10 1528436
11 5878600
12 22673308
13 87662200
14 339653880
15 1318498920
16 5126862150
17 19965297660
18 77855108100
19 303969268680
20 1188105796020
21 4648590733800
22 18205030164360
23 71356399639200
24 279909199969308
25 1098799886728152

List of values

[1, 10, 38, 140, 518, 1932, 7260, 27456, 104390, 398684, 1528436, 5878600, 22673308, 87662200, 339653880, 1318498920, 5126862150, 19965297660, 77855108100, 303969268680, 1188105796020, 4648590733800, 18205030164360, 71356399639200, 279909199969308, 1098799886728152]

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

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