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 | 1 |
| 2 | 4 |
| 3 | 19 |
| 4 | 98 |
| 5 | 526 |
| 6 | 2892 |
| 7 | 16159 |
| 8 | 91338 |
| 9 | 520794 |
| 10 | 2989688 |
| 11 | 17256275 |
| 12 | 100046894 |
| 13 | 582204290 |
| 14 | 3398722420 |
| 15 | 19894375665 |
| 16 | 116724946350 |
| 17 | 686260868346 |
| 18 | 4042058735880 |
| 19 | 23846068472626 |
| 20 | 140882925528892 |
| 21 | 833421929615236 |
| 22 | 4936088399361876 |
| 23 | 29266184138206509 |
| 24 | 173689743532678182 |