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) |
|---|---|
| 1 | 8 |
| 2 | 31 |
| 3 | 72 |
| 4 | 306 |
| 5 | 1197 |
| 6 | 4849 |
| 7 | 23037 |
| 8 | 114810 |
| 9 | 603229 |
| 10 | 3319946 |
| 11 | 18585700 |
| 12 | 105379875 |
| 13 | 603107047 |
| 14 | 3467522323 |
| 15 | 19998520262 |
| 16 | 115602617979 |
| 17 | 669078024352 |
| 18 | 3875760664026 |
| 19 | 22464758703891 |
| 20 | 130258464383067 |
| 21 | 755475828119163 |