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 | 6 |
| 2 | 27 |
| 3 | 110 |
| 4 | 387 |
| 5 | 1266 |
| 6 | 3896 |
| 7 | 11340 |
| 8 | 31629 |
| 9 | 84992 |
| 10 | 221028 |
| 11 | 558450 |
| 12 | 1375615 |
| 13 | 3310764 |
| 14 | 7803069 |
| 15 | 18044374 |
| 16 | 40998078 |
| 17 | 91653990 |
| 18 | 201842383 |
| 19 | 438312534 |
| 20 | 939439674 |
| 21 | 1988944070 |
| 22 | 4162521165 |
| 23 | 8617025112 |
| 24 | 17655688602 |
| 25 | 35823617658 |
| 26 | 72015578091 |
| 27 | 143499705550 |
| 28 | 283544586489 |
| 29 | 555779906772 |