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 | 13 |
| 2 | 65 |
| 3 | 105 |
| 4 | 283 |
| 5 | 2106 |
| 6 | 8250 |
| 7 | 32223 |
| 8 | 159440 |
| 9 | 703465 |
| 10 | 2973340 |
| 11 | 13494853 |
| 12 | 60180498 |
| 13 | 262407902 |
| 14 | 1167392813 |
| 15 | 5190322216 |
| 16 | 22874608873 |
| 17 | 101334971043 |
| 18 | 449454168985 |
| 19 | 1987423197338 |
| 20 | 8798329818980 |
| 21 | 38980239305306 |
| 22 | 172530975264447 |