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 | 3 |
| 3 | 19 |
| 4 | 183 |
| 5 | 2371 |
| 6 | 38703 |
| 7 | 763099 |
| 8 | 17648823 |
| 9 | 468603091 |
| 10 | 14050842303 |
| 11 | 469643495179 |
| 12 | 17315795469063 |
| 13 | 698171064855811 |
| 14 | 30561156525545103 |
| 15 | 1443380517590979259 |
| 16 | 73161586346500098903 |
| 17 | 3961555049961803092531 |
| 18 | 228225249142441259147103 |
| 19 | 13938493569348563803135339 |