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 | 462 |
| 2 | 1714 |
| 3 | 6405 |
| 4 | 24038 |
| 5 | 90440 |
| 6 | 340746 |
| 7 | 1284780 |
| 8 | 4846101 |
| 9 | 18282268 |
| 10 | 68974905 |
| 11 | 260225005 |
| 12 | 981727406 |
| 13 | 3703492842 |
| 14 | 13970426589 |
| 15 | 52697057080 |
| 16 | 198766661883 |
| 17 | 749693097170 |
| 18 | 2827538839901 |
| 19 | 10664018934360 |
| 20 | 40218182084976 |