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 | 3 |
| 2 | 13 |
| 3 | 58 |
| 4 | 257 |
| 5 | 1126 |
| 6 | 4882 |
| 7 | 20980 |
| 8 | 89497 |
| 9 | 379438 |
| 10 | 1600406 |
| 11 | 6720748 |
| 12 | 28117498 |
| 13 | 117254268 |
| 14 | 487589572 |
| 15 | 2022568168 |
| 16 | 8371423177 |
| 17 | 34581780478 |
| 18 | 142605399982 |
| 19 | 587138954428 |
| 20 | 2413944555742 |
| 21 | 9911778919348 |
| 22 | 40650232625212 |
| 23 | 166534680737368 |
| 24 | 681576405563722 |