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 | 2 |
| 3 | 6 |
| 4 | 12 |
| 5 | 66 |
| 6 | 30 |
| 7 | 210 |
| 8 | 390 |
| 9 | 1365 |
| 10 | 2310 |
| 11 | 3990 |
| 12 | 10920 |
| 13 | 2730 |
| 14 | 84630 |
| 15 | 53130 |
| 16 | 87780 |
| 17 | 114114 |
| 18 | 760760 |
| 19 | 2042040 |
| 20 | 1345890 |
| 21 | 285285 |
| 22 | 1902810 |
| 23 | 570570 |
| 24 | 1141140 |
| 25 | 25571910 |
| 26 | 30240210 |
| 27 | 2282280 |
| 28 | 358888530 |
| 29 | 514083570 |
| 30 | 413092680 |
| 31 | 998887890 |
| 32 | 761140380 |
| 33 | 1155284130 |
| 34 | 3082219140 |
| 35 | 8125850460 |
| 36 | 11532931410 |
| 37 | 17440042620 |
| 38 | 8254436190 |