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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 14 |
| 6 | 43 |
| 7 | 140 |
| 8 | 474 |
| 9 | 1650 |
| 10 | 5865 |
| 11 | 21194 |
| 12 | 77623 |
| 13 | 287492 |
| 14 | 1074915 |
| 15 | 4051824 |
| 16 | 15381073 |
| 17 | 58749102 |
| 18 | 225621404 |
| 19 | 870686810 |
| 20 | 3374625925 |
| 21 | 13130575110 |
| 22 | 51271434788 |
| 23 | 200845390668 |
| 24 | 789081913225 |
| 25 | 3108496250028 |
| 26 | 12275905239752 |
| 27 | 48590260462470 |
| 28 | 192736593501813 |
| 29 | 766007363990640 |
| 30 | 3049978926971396 |
| 31 | 12164745517874576 |
| 32 | 48596364360237882 |
| 33 | 194426663474794450 |
| 34 | 778968350863994065 |