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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.

A302108 G.f.: Sum_{n>=0} ( (1+x)^n - (1-x)^n )^n / 2^n.

Table of values

n a(n)
0 1
1 1
2 4
3 27
4 256
5 3152
6 47680
7 854802
8 17711872
9 416372620
10 10947581056
11 318304921165
12 10140097538560
13 351219420860694
14 13141237470041536
15 528208859187285899
16 22698715714385041920
17 1038485165851106374784
18 50395972495225521776384
19 2585595617532863164095240
20 139835798146777767415142912
21 7950987913261988583226011167

List of values

[1, 1, 4, 27, 256, 3152, 47680, 854802, 17711872, 416372620, 10947581056, 318304921165, 10140097538560, 351219420860694, 13141237470041536, 528208859187285899, 22698715714385041920, 1038485165851106374784, 50395972495225521776384, 2585595617532863164095240, 139835798146777767415142912, 7950987913261988583226011167]

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

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