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 | 17 |
| 2 | 79 |
| 3 | 293 |
| 4 | 1267 |
| 5 | 5527 |
| 6 | 24739 |
| 7 | 112143 |
| 8 | 513867 |
| 9 | 2373647 |
| 10 | 11035789 |
| 11 | 51580623 |
| 12 | 242148559 |
| 13 | 1141014203 |
| 14 | 5393615257 |
| 15 | 25565881003 |
| 16 | 121473190683 |
| 17 | 578379092367 |
| 18 | 2758998721111 |
| 19 | 13182804752499 |
| 20 | 63081972236317 |
| 21 | 302258226703131 |