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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.

A386612 a(n) = Sum_{k=0..n-1} binomial(4*k+1,k) * binomial(4*n-4*k,n-k-1).

Table of values

n a(n)
0 0
1 1
2 13
3 142
4 1464
5 14689
6 145154
7 1420812
8 13818784
9 133793940
10 1291073809
11 12426782294
12 119371355672
13 1144851458526
14 10965655515588
15 104919037771224
16 1002960800712720
17 9580390527192940
18 91453374122574372
19 872513477065735768
20 8320168165323802464
21 79305962393873976417

List of values

[0, 1, 13, 142, 1464, 14689, 145154, 1420812, 13818784, 133793940, 1291073809, 12426782294, 119371355672, 1144851458526, 10965655515588, 104919037771224, 1002960800712720, 9580390527192940, 91453374122574372, 872513477065735768, 8320168165323802464, 79305962393873976417]

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

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