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 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 32 |
| 6 | 39 |
| 7 | 71 |
| 8 | 465 |
| 9 | 536 |
| 10 | 1001 |
| 11 | 8544 |
| 12 | 9545 |
| 13 | 18089 |
| 14 | 190435 |
| 15 | 208524 |
| 16 | 398959 |
| 17 | 4996032 |
| 18 | 5394991 |
| 19 | 10391023 |
| 20 | 150869313 |
| 21 | 161260336 |
| 22 | 312129649 |
| 23 | 5155334720 |
| 24 | 5467464369 |
| 25 | 10622799089 |
| 26 | 196677847971 |
| 27 | 207300647060 |
| 28 | 403978495031 |
| 29 | 8286870547680 |
| 30 | 8690849042711 |