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 | 9 |
| 2 | 41 |
| 3 | 188 |
| 4 | 867 |
| 5 | 4010 |
| 6 | 18574 |
| 7 | 86096 |
| 8 | 399225 |
| 9 | 1851529 |
| 10 | 8587802 |
| 11 | 39833891 |
| 12 | 184770640 |
| 13 | 857073208 |
| 14 | 3975623218 |
| 15 | 18441391129 |
| 16 | 85542653145 |
| 17 | 396800342804 |
| 18 | 1840608838251 |
| 19 | 8537899488042 |
| 20 | 39604141848678 |
| 21 | 183708898915088 |
| 22 | 852157340908409 |
| 23 | 3952841397780937 |
| 24 | 18335763176322738 |