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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.

A383716 a(n) = Sum_{k=0..n} binomial(4*n+1,k) * binomial(4*n-k,n-k).

Table of values

n a(n)
0 1
1 9
2 127
3 2001
4 33151
5 565249
6 9819391
7 172826369
8 3071424511
9 54992986113
10 990477877247
11 17925526679553
12 325710362673151
13 5938147061596161
14 108571788661555199
15 1990032340043366401
16 36554697970011340799
17 672749920475758460929
18 12402180156683794251775

List of values

[1, 9, 127, 2001, 33151, 565249, 9819391, 172826369, 3071424511, 54992986113, 990477877247, 17925526679553, 325710362673151, 5938147061596161, 108571788661555199, 1990032340043366401, 36554697970011340799, 672749920475758460929, 12402180156683794251775]

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

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