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 | 2 |
| 2 | 21 |
| 3 | 44 |
| 4 | 461 |
| 5 | 966 |
| 6 | 10121 |
| 7 | 21208 |
| 8 | 222201 |
| 9 | 465610 |
| 10 | 4878301 |
| 11 | 10222212 |
| 12 | 107100421 |
| 13 | 224423054 |
| 14 | 2351330961 |
| 15 | 4927084976 |
| 16 | 51622180721 |
| 17 | 108171446418 |
| 18 | 1133336644901 |
| 19 | 2374844736220 |
| 20 | 24881784007101 |