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) |
|---|---|
| 1 | 3 |
| 2 | 4 |
| 3 | 5 |
| 4 | 20 |
| 5 | 21 |
| 6 | 29 |
| 7 | 119 |
| 8 | 120 |
| 9 | 169 |
| 10 | 696 |
| 11 | 697 |
| 12 | 985 |
| 13 | 4059 |
| 14 | 4060 |
| 15 | 5741 |
| 16 | 23660 |
| 17 | 23661 |
| 18 | 33461 |
| 19 | 137903 |
| 20 | 137904 |
| 21 | 195025 |
| 22 | 803760 |
| 23 | 803761 |
| 24 | 1136689 |
| 25 | 4684659 |
| 26 | 4684660 |
| 27 | 6625109 |
| 28 | 27304196 |
| 29 | 27304197 |
| 30 | 38613965 |
| 31 | 159140519 |
| 32 | 159140520 |
| 33 | 225058681 |
| 34 | 927538920 |
| 35 | 927538921 |
| 36 | 1311738121 |
| 37 | 5406093003 |
| 38 | 5406093004 |
| 39 | 7645370045 |