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 | 1 |
| 2 | 121 |
| 3 | 631 |
| 4 | 2059 |
| 5 | 6399 |
| 6 | 19483 |
| 7 | 58807 |
| 8 | 176859 |
| 9 | 531103 |
| 10 | 1593931 |
| 11 | 4782519 |
| 12 | 14348395 |
| 13 | 43046143 |
| 14 | 129139515 |
| 15 | 387419767 |
| 16 | 1162260667 |
| 17 | 3486783519 |
| 18 | 10460352235 |
| 19 | 31381058551 |
| 20 | 94143177675 |
| 21 | 282429535231 |
| 22 | 847288608091 |
| 23 | 2541865826871 |