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 | 0 |
| 2 | 10 |
| 3 | 13 |
| 4 | 63 |
| 5 | 80 |
| 6 | 370 |
| 7 | 469 |
| 8 | 2159 |
| 9 | 2736 |
| 10 | 12586 |
| 11 | 15949 |
| 12 | 73359 |
| 13 | 92960 |
| 14 | 427570 |
| 15 | 541813 |
| 16 | 2492063 |
| 17 | 3157920 |
| 18 | 14524810 |
| 19 | 18405709 |
| 20 | 84656799 |
| 21 | 107276336 |
| 22 | 493415986 |
| 23 | 625252309 |
| 24 | 2875839119 |
| 25 | 3644237520 |
| 26 | 16761618730 |
| 27 | 21240172813 |
| 28 | 97693873263 |
| 29 | 123796799360 |
| 30 | 569401620850 |