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 | 9 |
| 2 | 88 |
| 3 | 918 |
| 4 | 10012 |
| 5 | 112284 |
| 6 | 1280224 |
| 7 | 14735016 |
| 8 | 170493712 |
| 9 | 1978495632 |
| 10 | 22996386688 |
| 11 | 267526283616 |
| 12 | 3113740490176 |
| 13 | 36250383835584 |
| 14 | 422090112767488 |
| 15 | 4915093625981568 |
| 16 | 57237016922874112 |
| 17 | 666549376289097984 |