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.
n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 25 |
6 | 140 |
7 | 1561 |
8 | 19586 |
9 | 228425 |
10 | 2870160 |
11 | 44172601 |
12 | 780614846 |
13 | 14499946825 |
14 | 284310704860 |
15 | 6089231941521 |
16 | 142225796401786 |
17 | 3537029819020905 |
18 | 92766573133851240 |
19 | 2577870903366020521 |
20 | 75999605064376599606 |
21 | 2362944241092314079145 |