cp's OEIS Frontend

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.

A378327 a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n*k,k) / ((n-1)*k + 1).

Table of values

n a(n)
0 1
1 2
2 5
3 25
4 257
5 4361
6 104425
7 3241316
8 123865313
9 5628753361
10 296671566941
11 17798975341467
12 1197924420178381
13 89394126594968755
14 7326377073291002147
15 654215578855903951141
16 63225054646397348577601
17 6575059243843086616460321
18 732138834180570978286488133

List of values

[1, 2, 5, 25, 257, 4361, 104425, 3241316, 123865313, 5628753361, 296671566941, 17798975341467, 1197924420178381, 89394126594968755, 7326377073291002147, 654215578855903951141, 63225054646397348577601, 6575059243843086616460321, 732138834180570978286488133]