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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.

A357672 a(n) = Sum_{k = 0..n} binomial(n+k-1,k) * Sum_{k = 0..n} binomial(n+k-1,k)^2.

Table of values

n a(n)
0 1
1 4
2 84
3 2920
4 121940
5 5607504
6 273908712
7 13947188112
8 732102614100
9 39332168075200
10 2152235533317584
11 119531412173662944
12 6720552415489860584
13 381775182057562837600
14 21879043278489630349200
15 1263402662473729731877920
16 73438613319490294002441300
17 4293679728171938162242298400

List of values

[1, 4, 84, 2920, 121940, 5607504, 273908712, 13947188112, 732102614100, 39332168075200, 2152235533317584, 119531412173662944, 6720552415489860584, 381775182057562837600, 21879043278489630349200, 1263402662473729731877920, 73438613319490294002441300, 4293679728171938162242298400]

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

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