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 | 8 |
| 4 | 39 |
| 5 | 226 |
| 6 | 2283 |
| 7 | 36789 |
| 8 | 1062679 |
| 9 | 55717077 |
| 10 | 5405078682 |
| 11 | 972656526492 |
| 12 | 325183692812200 |
| 13 | 202373967993972497 |
| 14 | 235081289816026793049 |
| 15 | 511296223391186047847309 |
| 16 | 2088912833728676472658628201 |
| 17 | 16081914207958884651686215477871 |
| 18 | 234010862353438997655954463710225233 |