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 | 0 |
| 1 | 1 |
| 2 | 42 |
| 3 | 817 |
| 4 | 8429 |
| 5 | 55627 |
| 6 | 268272 |
| 7 | 1030101 |
| 8 | 3331117 |
| 9 | 9425128 |
| 10 | 23970089 |
| 11 | 55880968 |
| 12 | 121188860 |
| 13 | 247272012 |
| 14 | 478904297 |
| 15 | 886654486 |
| 16 | 1578265414 |
| 17 | 2713745819 |
| 18 | 4525019252 |
| 19 | 7341094011 |
| 20 | 11619845543 |
| 21 | 17987638185 |
| 22 | 27288156478 |
| 23 | 40641967587 |
| 24 | 59518495595 |
| 25 | 85822255610 |