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 | 10 |
| 3 | 110 |
| 4 | 1265 |
| 5 | 15235 |
| 6 | 191785 |
| 7 | 2519605 |
| 8 | 34494625 |
| 9 | 491432590 |
| 10 | 7276062838 |
| 11 | 111816814439 |
| 12 | 1781492191281 |
| 13 | 29392907305322 |
| 14 | 501677394880530 |
| 15 | 8849027884862077 |
| 16 | 161155012811798819 |
| 17 | 3027460412190175918 |
| 18 | 58617635130507630386 |
| 19 | 1168800382939975874066 |