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 | 0 |
| 1 | 1 |
| 2 | 9 |
| 3 | 88 |
| 4 | 935 |
| 5 | 10576 |
| 6 | 125398 |
| 7 | 1541842 |
| 8 | 19510569 |
| 9 | 252692488 |
| 10 | 3336041258 |
| 11 | 44754332228 |
| 12 | 608627917092 |
| 13 | 8374308526624 |
| 14 | 116400823021244 |
| 15 | 1632397871933462 |
| 16 | 23073139088034053 |
| 17 | 328412887616247352 |
| 18 | 4703787284447392654 |
| 19 | 67751302345297146628 |
| 20 | 980837632950784897364 |