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 | 43 |
| 3 | 451 |
| 4 | 9415 |
| 5 | 162409 |
| 6 | 3037561 |
| 7 | 55263473 |
| 8 | 1017093992 |
| 9 | 18633949879 |
| 10 | 342050825969 |
| 11 | 6273663002379 |
| 12 | 115107979930355 |
| 13 | 2111655465575629 |
| 14 | 38740910476086035 |
| 15 | 710728644139932355 |
| 16 | 13038974254406437397 |
| 17 | 239210680096992061776 |
| 18 | 4388527184214799104521 |