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.

A209288 Main diagonal of the quadruple recurrence x(i,j,k,m) = x(i-1,j,k,m) + x(i,j-1,k,m) + x(i,j,k-1,m) + x(i,j,k,m-1) with x(i,j,k,m) = 1 if 0 in {i,j,k,m}.

Table of values

n a(n)
0 1
1 4
2 196
3 22096
4 3323092
5 574346824
6 107697153304
7 21304602938056
8 4376897152490644
9 924871720044550888
10 199731547307306769736
11 43887077830441507774336
12 9780481173520567895278600
13 2205358814500087896152369104
14 502225405515985555630557626848

List of values

[1, 4, 196, 22096, 3323092, 574346824, 107697153304, 21304602938056, 4376897152490644, 924871720044550888, 199731547307306769736, 43887077830441507774336, 9780481173520567895278600, 2205358814500087896152369104, 502225405515985555630557626848]