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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.

A227469 a(n) = binomial((n+1)^2, n) * (2*n+1) / (n+1)^2 for n>=0.

Table of values

n a(n)
0 1
1 3
2 20
3 245
4 4554
5 115192
6 3709992
7 145597545
8 6750522350
9 361424043596
10 21958844607336
11 1493260499980119
12 112400273159533800
13 9279595605913516080
14 833858283261973732944
15 81027308003810095983825
16 8466793463341565312119830
17 946776552967215128481968260
18 112816032067073649248569919400

List of values

[1, 3, 20, 245, 4554, 115192, 3709992, 145597545, 6750522350, 361424043596, 21958844607336, 1493260499980119, 112400273159533800, 9279595605913516080, 833858283261973732944, 81027308003810095983825, 8466793463341565312119830, 946776552967215128481968260, 112816032067073649248569919400]

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

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