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 | 3 |
| 4 | 7 |
| 5 | 28 |
| 6 | 104 |
| 7 | 448 |
| 8 | 1886 |
| 9 | 8212 |
| 10 | 35556 |
| 11 | 155124 |
| 12 | 675897 |
| 13 | 2950074 |
| 14 | 12872294 |
| 15 | 56188904 |
| 16 | 245253691 |
| 17 | 1070581703 |
| 18 | 4673231521 |
| 19 | 20399699635 |
| 20 | 89048927767 |
| 21 | 388718917440 |
| 22 | 1696845506274 |
| 23 | 7407120344070 |
| 24 | 32333775400516 |
| 25 | 141144364258374 |
| 26 | 616127577376396 |