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 | 16 |
| 3 | 51 |
| 4 | 276 |
| 5 | 969 |
| 6 | 3504 |
| 7 | 10659 |
| 8 | 30954 |
| 9 | 81719 |
| 10 | 205040 |
| 11 | 482885 |
| 12 | 1088100 |
| 13 | 2340135 |
| 14 | 4850640 |
| 15 | 9694845 |
| 16 | 18789795 |
| 17 | 35357670 |
| 18 | 64833120 |
| 19 | 115997970 |
| 20 | 203014680 |
| 21 | 347993910 |
| 22 | 585292320 |
| 23 | 966955410 |
| 24 | 1571349780 |
| 25 | 2514084066 |
| 26 | 3964589856 |
| 27 | 6167026726 |
| 28 | 9470900056 |
| 29 | 14369476066 |
| 30 | 21554373984 |