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 | 1 |
| 3 | 6 |
| 4 | 22 |
| 5 | 69 |
| 6 | 224 |
| 7 | 819 |
| 8 | 3296 |
| 9 | 13942 |
| 10 | 60941 |
| 11 | 276399 |
| 12 | 1309207 |
| 13 | 6479609 |
| 14 | 33377271 |
| 15 | 178186018 |
| 16 | 983386188 |
| 17 | 5604262733 |
| 18 | 32955823822 |
| 19 | 199771724691 |
| 20 | 1246747659198 |
| 21 | 8000380516898 |
| 22 | 52728354046939 |
| 23 | 356593588048023 |
| 24 | 2472544614851517 |
| 25 | 17563971319301049 |
| 26 | 127727505109579581 |