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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.

A181685 Expansion of 36*x^2*(1+6*x-36*x^2) / ( (1-6*x)^2 *(1+6*x+36*x^2) ).

Table of values

n a(n)
1 0
2 36
3 432
4 1296
5 15552
6 139968
7 559872
8 5038848
9 40310784
10 181398528
11 1451188224
12 10883911680
13 52242776064
14 391820820480
15 2821109907456
16 14105549537280
17 101559956668416
18 710919696678912
19 3656158440062976
20 25593109080440832
21 175495605123022848
22 921351926895869952

List of values

[0, 36, 432, 1296, 15552, 139968, 559872, 5038848, 40310784, 181398528, 1451188224, 10883911680, 52242776064, 391820820480, 2821109907456, 14105549537280, 101559956668416, 710919696678912, 3656158440062976, 25593109080440832, 175495605123022848, 921351926895869952]

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

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