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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.

A103978 Expansion of (sqrt(1-12*x^2)+12*x^2+2*x-1)/(2*x*sqrt(1-12*x^2)).

Table of values

n a(n)
0 1
1 3
2 6
3 9
4 54
5 54
6 540
7 405
8 5670
9 3402
10 61236
11 30618
12 673596
13 288684
14 7505784
15 2814669
16 84440070
17 28146690
18 956987460
19 287096238
20 10909657044
21 2975361012
22 124965162504
23 31241290626
24 1437099368796
25 331638315876
26 16581915793800

List of values

[1, 3, 6, 9, 54, 54, 540, 405, 5670, 3402, 61236, 30618, 673596, 288684, 7505784, 2814669, 84440070, 28146690, 956987460, 287096238, 10909657044, 2975361012, 124965162504, 31241290626, 1437099368796, 331638315876, 16581915793800]

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

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