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 | 6 |
| 2 | 24 |
| 3 | 78 |
| 4 | 222 |
| 5 | 576 |
| 6 | 1392 |
| 7 | 3180 |
| 8 | 6936 |
| 9 | 14550 |
| 10 | 29520 |
| 11 | 58176 |
| 12 | 111750 |
| 13 | 209820 |
| 14 | 385968 |
| 15 | 696960 |
| 16 | 1237470 |
| 17 | 2163456 |
| 18 | 3728904 |
| 19 | 6343068 |
| 20 | 10658880 |
| 21 | 17708412 |
| 22 | 29108880 |
| 23 | 47373696 |
| 24 | 76378992 |
| 25 | 122058870 |
| 26 | 193435248 |
| 27 | 304134558 |
| 28 | 474609180 |
| 29 | 735374016 |
| 30 | 1131698448 |
| 31 | 1730375436 |