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 | 8 |
| 2 | 36 |
| 3 | 164 |
| 4 | 750 |
| 5 | 3434 |
| 6 | 15446 |
| 7 | 69136 |
| 8 | 309748 |
| 9 | 1386973 |
| 10 | 6207948 |
| 11 | 27781867 |
| 12 | 124317636 |
| 13 | 556310068 |
| 14 | 2489502301 |
| 15 | 11140314293 |
| 16 | 49852273554 |
| 17 | 223086037878 |
| 18 | 998302588120 |
| 19 | 4467360525658 |
| 20 | 19991251154656 |
| 21 | 89460006607948 |
| 22 | 400329985806851 |