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 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 27 |
| 6 | 76 |
| 7 | 242 |
| 8 | 852 |
| 9 | 3016 |
| 10 | 11262 |
| 11 | 47004 |
| 12 | 204761 |
| 13 | 894673 |
| 14 | 4134909 |
| 15 | 20370101 |
| 16 | 101904474 |
| 17 | 521459464 |
| 18 | 2813783214 |
| 19 | 15616060213 |
| 20 | 87143803196 |
| 21 | 502477538546 |
| 22 | 3039137586808 |
| 23 | 18763942581733 |
| 24 | 116737580008529 |
| 25 | 742909490860950 |
| 26 | 4846956807516551 |