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 | 14 |
| 2 | 105 |
| 3 | 574 |
| 4 | 2576 |
| 5 | 10052 |
| 6 | 35273 |
| 7 | 113794 |
| 8 | 342699 |
| 9 | 974176 |
| 10 | 2635955 |
| 11 | 6833540 |
| 12 | 17061345 |
| 13 | 41197422 |
| 14 | 96544003 |
| 15 | 220212384 |
| 16 | 490104727 |
| 17 | 1066552228 |
| 18 | 2273590095 |
| 19 | 4755188704 |
| 20 | 9771319068 |
| 21 | 19751596934 |
| 22 | 39317784863 |
| 23 | 77150246040 |
| 24 | 149357609184 |
| 25 | 285497384004 |
| 26 | 539227765104 |
| 27 | 1006978117880 |