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 | 11 |
| 5 | 81 |
| 6 | 176 |
| 7 | 1406 |
| 8 | 3311 |
| 9 | 27636 |
| 10 | 68211 |
| 11 | 585162 |
| 12 | 1489488 |
| 13 | 13019909 |
| 14 | 33870540 |
| 15 | 300138696 |
| 16 | 793542167 |
| 17 | 7105216833 |
| 18 | 19022318084 |
| 19 | 171717015470 |
| 20 | 464333035881 |
| 21 | 4219267597578 |
| 22 | 11502251937176 |
| 23 | 105085831400550 |
| 24 | 288417894029200 |
| 25 | 2647012241261856 |
| 26 | 7306488667126803 |