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 | 1 |
| 2 | 71 |
| 3 | 1205 |
| 4 | 11075 |
| 5 | 70295 |
| 6 | 345857 |
| 7 | 1409387 |
| 8 | 4962365 |
| 9 | 15539750 |
| 10 | 44192010 |
| 11 | 115917118 |
| 12 | 283828498 |
| 13 | 654885730 |
| 14 | 1434717550 |
| 15 | 3002927770 |
| 16 | 6035661334 |
| 17 | 11699568079 |
| 18 | 21951176425 |
| 19 | 39988722875 |
| 20 | 70920437325 |
| 21 | 122735050305 |