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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.

A379244 G.f. A(x) satisfies A(x) = ( (1 + x*A(x)^3)/(1 - x*A(x)) )^2.

Table of values

n a(n)
0 1
1 4
2 40
3 540
4 8400
5 141876
6 2528760
7 46815116
8 891483808
9 17350187364
10 343578992328
11 6900588813564
12 140230648164720
13 2878066866407316
14 59571280942854808
15 1242093725341221996
16 26064579113472078144
17 550041399791036747460
18 11665771061882347813224
19 248527169321049466503132

List of values

[1, 4, 40, 540, 8400, 141876, 2528760, 46815116, 891483808, 17350187364, 343578992328, 6900588813564, 140230648164720, 2878066866407316, 59571280942854808, 1242093725341221996, 26064579113472078144, 550041399791036747460, 11665771061882347813224, 248527169321049466503132]

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

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