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 | 2 |
| 2 | 2 |
| 3 | 26 |
| 4 | 34 |
| 5 | 122 |
| 6 | 3050 |
| 7 | 5546 |
| 8 | 22242 |
| 9 | 98810 |
| 10 | 5080522 |
| 11 | 11405066 |
| 12 | 56193994 |
| 13 | 254584202 |
| 14 | 1716042442 |
| 15 | 150252560666 |
| 16 | 411017469922 |
| 17 | 2350507292282 |
| 18 | 11932655971850 |
| 19 | 78499814602250 |
| 20 | 637469575273194 |
| 21 | 97081641610090730 |
| 22 | 310147011889004842 |
| 23 | 2063353546134164090 |