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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.

A384168 a(n) = 3^n * n! * binomial(4*n/3,n) * Sum_{k=1..n} 1/(n+3*k).

Table of values

n a(n)
1 1
2 13
3 234
4 5566
5 165944
6 5966136
7 251491120
8 12169996912
9 665146831680
10 40530954643840
11 2724842629685120
12 200361647815660800
13 15997170878205905920
14 1378271357428552115200
15 127459020533529062246400
16 12593128815600367187507200
17 1323895109721239722075136000

List of values

[1, 13, 234, 5566, 165944, 5966136, 251491120, 12169996912, 665146831680, 40530954643840, 2724842629685120, 200361647815660800, 15997170878205905920, 1378271357428552115200, 127459020533529062246400, 12593128815600367187507200, 1323895109721239722075136000]

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

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