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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 8 |
| 11 | 43 |
| 12 | 180 |
| 13 | 657 |
| 14 | 2175 |
| 15 | 6746 |
| 16 | 19923 |
| 17 | 56766 |
| 18 | 157273 |
| 19 | 426372 |
| 20 | 1135812 |
| 21 | 2983032 |
| 22 | 7742322 |
| 23 | 19896231 |
| 24 | 50695676 |
| 25 | 128224079 |
| 26 | 322221166 |
| 27 | 805088502 |
| 28 | 2001225122 |
| 29 | 4951394924 |
| 30 | 12198848726 |
| 31 | 29938095480 |
| 32 | 73210846964 |