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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.

A147722 Row sums of Riordan array ((1-3x)/(1-4x+x^2), x(1-x)/(1-4x+x^2)).

Table of values

n a(n)
0 1
1 2
2 8
3 36
4 164
5 748
6 3412
7 15564
8 70996
9 323852
10 1477268
11 6738636
12 30738644
13 140215948
14 639602452
15 2917580364
16 13308696916
17 60708323852
18 276924225428
19 1263204479436
20 5762173946324
21 26284460772748
22 119897955971092
23 546920858309964
24 2494808379607636
25 11380200181418252

List of values

[1, 2, 8, 36, 164, 748, 3412, 15564, 70996, 323852, 1477268, 6738636, 30738644, 140215948, 639602452, 2917580364, 13308696916, 60708323852, 276924225428, 1263204479436, 5762173946324, 26284460772748, 119897955971092, 546920858309964, 2494808379607636, 11380200181418252]

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

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