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 | 0 |
| 2 | 3 |
| 3 | 8 |
| 4 | 30 |
| 5 | 103 |
| 6 | 364 |
| 7 | 1276 |
| 8 | 4483 |
| 9 | 15740 |
| 10 | 55274 |
| 11 | 194095 |
| 12 | 681576 |
| 13 | 2393384 |
| 14 | 8404483 |
| 15 | 29512736 |
| 16 | 103635366 |
| 17 | 363920471 |
| 18 | 1277923892 |
| 19 | 4487489988 |
| 20 | 15758032643 |
| 21 | 55335074484 |
| 22 | 194311722642 |
| 23 | 682334774239 |
| 24 | 2396050726160 |
| 25 | 8413845078800 |