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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.

A074635 a(0)=1, a(n) = Sum_{k=0..n} (binomial(n,k)^2 * binomial(n+k,k+1)^2)/n^2.

Table of values

n a(n)
0 1
1 2
2 14
3 162
4 2422
5 42366
6 824210
7 17315570
8 385569110
9 8985969258
10 217250577766
11 5413255505686
12 138331193497122
13 3611539459764086
14 96043941386294106
15 2595400550031689938
16 71127992129228040790
17 1973658406181654681730
18 55374306085337133154190

List of values

[1, 2, 14, 162, 2422, 42366, 824210, 17315570, 385569110, 8985969258, 217250577766, 5413255505686, 138331193497122, 3611539459764086, 96043941386294106, 2595400550031689938, 71127992129228040790, 1973658406181654681730, 55374306085337133154190]

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

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