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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.

A371814 a(n) = Sum_{k=0..n} (-1)^k * binomial(4*n-k-1,n-k).

Table of values

n a(n)
0 1
1 2
2 16
3 128
4 1068
5 9142
6 79612
7 701864
8 6244892
9 55962920
10 504375396
11 4567003520
12 41513817444
13 378596616452
14 3462411408136
15 31742042431048
16 291616814436124
17 2684123914512280
18 24746511514749280
19 228491677484832896
20 2112549277665243328

List of values

[1, 2, 16, 128, 1068, 9142, 79612, 701864, 6244892, 55962920, 504375396, 4567003520, 41513817444, 378596616452, 3462411408136, 31742042431048, 291616814436124, 2684123914512280, 24746511514749280, 228491677484832896, 2112549277665243328]

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

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