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 | 2 |
| 3 | 6 |
| 4 | 22 |
| 5 | 92 |
| 6 | 424 |
| 7 | 2106 |
| 8 | 11102 |
| 9 | 61436 |
| 10 | 353980 |
| 11 | 2110366 |
| 12 | 12955020 |
| 13 | 81569168 |
| 14 | 525106698 |
| 15 | 3447244188 |
| 16 | 23028080268 |
| 17 | 156246994264 |
| 18 | 1075127143948 |
| 19 | 7492458675666 |
| 20 | 52820934349420 |
| 21 | 376331681648402 |
| 22 | 2707312468516446 |
| 23 | 19650530699752470 |
| 24 | 143807774782994412 |
| 25 | 1060472244838174574 |
| 26 | 7875713244761349666 |
| 27 | 58876660310205135380 |
| 28 | 442862775457168812898 |
| 29 | 3350397169412102710198 |