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 | 15 |
| 2 | 114 |
| 3 | 569 |
| 4 | 2138 |
| 5 | 6562 |
| 6 | 17329 |
| 7 | 40765 |
| 8 | 87512 |
| 9 | 174452 |
| 10 | 327137 |
| 11 | 582784 |
| 12 | 993895 |
| 13 | 1632561 |
| 14 | 2595510 |
| 15 | 4009958 |
| 16 | 6040323 |
| 17 | 8895861 |
| 18 | 12839284 |
| 19 | 18196419 |
| 20 | 25366968 |
| 21 | 34836428 |
| 22 | 47189231 |
| 23 | 63123163 |
| 24 | 83465122 |
| 25 | 109188274 |
| 26 | 141430667 |
| 27 | 181515362 |
| 28 | 230972141 |
| 29 | 291560851 |
| 30 | 365296444 |