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 | 10 |
| 2 | 100 |
| 3 | 358 |
| 4 | 1309 |
| 5 | 5524 |
| 6 | 24086 |
| 7 | 109599 |
| 8 | 506870 |
| 9 | 2376964 |
| 10 | 11224757 |
| 11 | 53273404 |
| 12 | 253567712 |
| 13 | 1209244939 |
| 14 | 5773573436 |
| 15 | 27587164014 |
| 16 | 131879534567 |
| 17 | 630640340412 |
| 18 | 3016276415808 |
| 19 | 14428300026213 |
| 20 | 69023041742528 |
| 21 | 330213969177428 |