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 | 2 |
| 2 | 12 |
| 3 | 100 |
| 4 | 392 |
| 5 | 2420 |
| 6 | 4732 |
| 7 | 13872 |
| 8 | 21660 |
| 9 | 46552 |
| 10 | 117740 |
| 11 | 153760 |
| 12 | 312132 |
| 13 | 470680 |
| 14 | 569492 |
| 15 | 812912 |
| 16 | 1314612 |
| 17 | 2018980 |
| 18 | 2307020 |
| 19 | 3357772 |
| 20 | 4234440 |
| 21 | 4732152 |
| 22 | 6490640 |
| 23 | 7908572 |
| 24 | 10455720 |
| 25 | 14753312 |
| 26 | 17341700 |
| 27 | 18756712 |
| 28 | 21844692 |
| 29 | 23524380 |
| 30 | 27172432 |