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 | 37 |
| 3 | 289 |
| 4 | 2107 |
| 5 | 14329 |
| 6 | 105187 |
| 7 | 693579 |
| 8 | 4512054 |
| 9 | 28468770 |
| 10 | 176428599 |
| 11 | 1065826203 |
| 12 | 6323626404 |
| 13 | 36816785552 |
| 14 | 210944620532 |
| 15 | 1189766311028 |
| 16 | 6615412814561 |
| 17 | 36287015790029 |
| 18 | 196547683500294 |
| 19 | 1051919158699442 |
| 20 | 5566679104757415 |
| 21 | 29144209704259923 |
| 22 | 151039019038054896 |