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 | 14 |
| 4 | 65 |
| 5 | 301 |
| 6 | 1419 |
| 7 | 6786 |
| 8 | 32749 |
| 9 | 159108 |
| 10 | 777224 |
| 11 | 3813745 |
| 12 | 18783934 |
| 13 | 92811389 |
| 14 | 459832745 |
| 15 | 2283628771 |
| 16 | 11364500644 |
| 17 | 56659024320 |
| 18 | 282939657220 |
| 19 | 1414980598167 |
| 20 | 7085590965083 |
| 21 | 35523567248527 |
| 22 | 178289298823240 |
| 23 | 895697952270827 |
| 24 | 4503912366189604 |