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) |
|---|---|
| 1 | 9 |
| 2 | 65 |
| 3 | 205 |
| 4 | 1351 |
| 5 | 5982 |
| 6 | 34415 |
| 7 | 169352 |
| 8 | 904695 |
| 9 | 4547008 |
| 10 | 23448029 |
| 11 | 117953499 |
| 12 | 598260521 |
| 13 | 3002881031 |
| 14 | 15113176921 |
| 15 | 75724031785 |
| 16 | 379750748041 |
| 17 | 1900758538693 |
| 18 | 9516621521809 |
| 19 | 47607635835257 |
| 20 | 238183334181909 |
| 21 | 1191212059701364 |