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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.

A128418 a(n) = Sum_{k=0..n} 2^(n-k)*C(2n,n-k).

Table of values

n a(n)
0 1
1 5
2 33
3 233
4 1697
5 12585
6 94449
7 714873
8 5445441
9 41687369
10 320420753
11 2471008281
12 19108837601
13 148123058153
14 1150532419377
15 8952614975673
16 69772391628417
17 544532315255433
18 4255064364533457
19 33287174505889113
20 260669265451935777
21 2043172307192457513
22 16028314647309873777

List of values

[1, 5, 33, 233, 1697, 12585, 94449, 714873, 5445441, 41687369, 320420753, 2471008281, 19108837601, 148123058153, 1150532419377, 8952614975673, 69772391628417, 544532315255433, 4255064364533457, 33287174505889113, 260669265451935777, 2043172307192457513, 16028314647309873777]

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

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