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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.

A386702 a(n) = Sum_{k=0..n} (-3)^(n-k) * binomial(5*n,k).

Table of values

n a(n)
0 1
1 2
2 24
3 248
4 2676
5 29562
6 331956
7 3771896
8 43242660
9 499215146
10 5795429764
11 67587697872
12 791232339756
13 9292673328174
14 109440405341088
15 1291977861163968
16 15284200451058724
17 181147979395807002
18 2150493166839159936
19 25567085678133719880
20 304368033788893315896

List of values

[1, 2, 24, 248, 2676, 29562, 331956, 3771896, 43242660, 499215146, 5795429764, 67587697872, 791232339756, 9292673328174, 109440405341088, 1291977861163968, 15284200451058724, 181147979395807002, 2150493166839159936, 25567085678133719880, 304368033788893315896]

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

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