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 | 9 |
| 4 | 16 |
| 5 | 85 |
| 6 | 516 |
| 7 | 1519 |
| 8 | 6280 |
| 9 | 45441 |
| 10 | 431740 |
| 11 | 1394371 |
| 12 | 8370924 |
| 13 | 43960657 |
| 14 | 459099018 |
| 15 | 6135631545 |
| 16 | 23813007376 |
| 17 | 150537761905 |
| 18 | 1029390040764 |
| 19 | 7519458731131 |
| 20 | 101693768415220 |
| 21 | 1909742186139921 |
| 22 | 8269148260309882 |
| 23 | 60924484457661793 |
| 24 | 417027498430063800 |