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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.

A386699 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(5*n,k).

Table of values

n a(n)
0 1
1 7
2 69
3 733
4 8061
5 90462
6 1028871
7 11814376
8 136643085
9 1589311381
10 18569375114
11 217773347502
12 2561944357311
13 30219704365104
14 357278540928168
15 4232449819704768
16 50227362114232109
17 596988743410929087
18 7105534815529752831
19 84678089652554263155
20 1010268312800732117946

List of values

[1, 7, 69, 733, 8061, 90462, 1028871, 11814376, 136643085, 1589311381, 18569375114, 217773347502, 2561944357311, 30219704365104, 357278540928168, 4232449819704768, 50227362114232109, 596988743410929087, 7105534815529752831, 84678089652554263155, 1010268312800732117946]

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

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