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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.

A113956 Expansion of (1/((1-4x)c(x)))/(1-x^2c(x)/sqrt(1-4x)), c(x) the g.f. of A000108.

Table of values

n a(n)
0 1
1 3
2 12
3 48
4 194
5 787
6 3199
7 13017
8 52997
9 215831
10 879076
11 3580511
12 14582842
13 59388280
14 241829963
15 984609111
16 4008282780
17 16315179752
18 66399357417
19 270193396769
20 1099323033137
21 4472155924094
22 18190769442979
23 73982564102230

List of values

[1, 3, 12, 48, 194, 787, 3199, 13017, 52997, 215831, 879076, 3580511, 14582842, 59388280, 241829963, 984609111, 4008282780, 16315179752, 66399357417, 270193396769, 1099323033137, 4472155924094, 18190769442979, 73982564102230]

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

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