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.

A366012 a(n) = (1/(n+1)) * Sum_{k=0..n} binomial(n+k,k) * binomial(n*(n+1),n-k).

Table of values

n a(n)
0 1
1 2
2 13
3 156
4 2833
5 70098
6 2214280
7 85464984
8 3906724321
9 206648387550
10 12425282899588
11 837384222603448
12 62539219710804627
13 5127758187193514824
14 457986530357734020432
15 44263628968974498793648
16 4602969726808566383149761
17 512486177498084438210961270
18 60827938291895363867587959628

List of values

[1, 2, 13, 156, 2833, 70098, 2214280, 85464984, 3906724321, 206648387550, 12425282899588, 837384222603448, 62539219710804627, 5127758187193514824, 457986530357734020432, 44263628968974498793648, 4602969726808566383149761, 512486177498084438210961270, 60827938291895363867587959628]