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 | 13 |
| 1 | 109 |
| 2 | 707 |
| 3 | 4184 |
| 4 | 23720 |
| 5 | 131389 |
| 6 | 717927 |
| 7 | 3889730 |
| 8 | 20959485 |
| 9 | 112529350 |
| 10 | 602684170 |
| 11 | 3222508015 |
| 12 | 17211197614 |
| 13 | 91855019053 |
| 14 | 489986311295 |
| 15 | 2612981923560 |
| 16 | 13932202684630 |
| 17 | 74280962031435 |
| 18 | 396042187457445 |
| 19 | 2111713236134025 |
| 20 | 11260951929261216 |
| 21 | 60058486994980518 |
| 22 | 320362547860069042 |
| 23 | 1709162928241695964 |