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 | 7 |
| 3 | 59 |
| 4 | 544 |
| 5 | 5289 |
| 6 | 53256 |
| 7 | 549771 |
| 8 | 5782105 |
| 9 | 61698314 |
| 10 | 666014200 |
| 11 | 7257758425 |
| 12 | 79716116408 |
| 13 | 881431795012 |
| 14 | 9802065031740 |
| 15 | 109547572895811 |
| 16 | 1229634981583560 |
| 17 | 13855340183096319 |
| 18 | 156654090794892216 |