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 | 10 |
| 4 | 31 |
| 5 | 102 |
| 6 | 342 |
| 7 | 1167 |
| 8 | 4046 |
| 9 | 14213 |
| 10 | 50464 |
| 11 | 180847 |
| 12 | 653296 |
| 13 | 2376406 |
| 14 | 8697194 |
| 15 | 32002219 |
| 16 | 118322499 |
| 17 | 439364380 |
| 18 | 1637827543 |
| 19 | 6126870808 |
| 20 | 22993190147 |
| 21 | 86542625565 |
| 22 | 326607659370 |
| 23 | 1235650643059 |
| 24 | 4685502714403 |
| 25 | 17804713119018 |
| 26 | 67790202024365 |
| 27 | 258579199501709 |
| 28 | 988012193672223 |