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 | 11 |
| 3 | 131 |
| 4 | 1761 |
| 5 | 27601 |
| 6 | 506651 |
| 7 | 10674211 |
| 8 | 251686881 |
| 9 | 6524202561 |
| 10 | 183991725451 |
| 11 | 5605930566051 |
| 12 | 183428104316161 |
| 13 | 6409252239788881 |
| 14 | 237948848526923611 |
| 15 | 9346097294356706051 |
| 16 | 386966245108218203201 |
| 17 | 16836505067572362863361 |
| 18 | 767645305770283165781131 |