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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 49 |
| 6 | 240 |
| 7 | 1259 |
| 8 | 7570 |
| 9 | 47996 |
| 10 | 319518 |
| 11 | 2199295 |
| 12 | 15571610 |
| 13 | 112773478 |
| 14 | 832809504 |
| 15 | 6253673323 |
| 16 | 47650870538 |
| 17 | 367784975116 |
| 18 | 2871331929096 |
| 19 | 22647192990256 |
| 20 | 180277915464664 |
| 21 | 1447060793168493 |
| 22 | 11703567787559680 |
| 23 | 95312765368320637 |
| 24 | 781151020141584190 |