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 | -2 |
| 1 | 90 |
| 2 | 462 |
| 3 | 1540 |
| 4 | 4554 |
| 5 | 11592 |
| 6 | 27830 |
| 7 | 61686 |
| 8 | 131100 |
| 9 | 265650 |
| 10 | 521136 |
| 11 | 988770 |
| 12 | 1830248 |
| 13 | 3303630 |
| 14 | 5844762 |
| 15 | 10139734 |
| 16 | 17301060 |
| 17 | 29051484 |
| 18 | 48106430 |
| 19 | 78599556 |
| 20 | 126894174 |
| 21 | 202537080 |
| 22 | 319927608 |
| 23 | 500376870 |
| 24 | 775492564 |
| 25 | 1191453912 |
| 26 | 1815754710 |
| 27 | 2745870180 |
| 28 | 4122417420 |
| 29 | 6146311620 |