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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 23 |
| 5 | 92 |
| 6 | 368 |
| 7 | 1573 |
| 8 | 6687 |
| 9 | 29961 |
| 10 | 133258 |
| 11 | 612277 |
| 12 | 2801021 |
| 13 | 13118117 |
| 14 | 61169118 |
| 15 | 290680439 |
| 16 | 1374997022 |
| 17 | 6603579274 |
| 18 | 31604621290 |
| 19 | 153080685045 |
| 20 | 739012183165 |
| 21 | 3605324123927 |
| 22 | 17533159420196 |
| 23 | 86021715284351 |