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 | 10 |
| 2 | 21 |
| 3 | 220 |
| 4 | 461 |
| 5 | 4830 |
| 6 | 10121 |
| 7 | 106040 |
| 8 | 222201 |
| 9 | 2328050 |
| 10 | 4878301 |
| 11 | 51111060 |
| 12 | 107100421 |
| 13 | 1122115270 |
| 14 | 2351330961 |
| 15 | 24635424880 |
| 16 | 51622180721 |
| 17 | 540857232090 |
| 18 | 1133336644901 |
| 19 | 11874223681100 |
| 20 | 24881784007101 |
| 21 | 260692063752110 |
| 22 | 546265911511321 |
| 23 | 5723351178865320 |
| 24 | 11992968269241961 |