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 | 3 |
| 2 | 14 |
| 3 | 88 |
| 4 | 650 |
| 5 | 5257 |
| 6 | 45017 |
| 7 | 401010 |
| 8 | 3677344 |
| 9 | 34481492 |
| 10 | 329082191 |
| 11 | 3186043296 |
| 12 | 31214870385 |
| 13 | 308901931412 |
| 14 | 3083146893716 |
| 15 | 31001118379636 |
| 16 | 313734072027372 |
| 17 | 3193097704841990 |
| 18 | 32662597147529218 |
| 19 | 335616736745247652 |
| 20 | 3462524444288857191 |
| 21 | 35853293611333010079 |