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 | 2 |
| 2 | 5 |
| 3 | 22 |
| 4 | 68 |
| 5 | 206 |
| 6 | 631 |
| 7 | 1870 |
| 8 | 5467 |
| 9 | 15836 |
| 10 | 45416 |
| 11 | 129260 |
| 12 | 365565 |
| 13 | 1028122 |
| 14 | 2877697 |
| 15 | 8021010 |
| 16 | 22274476 |
| 17 | 61653850 |
| 18 | 170152275 |
| 19 | 468347046 |
| 20 | 1286055927 |
| 21 | 3523777912 |
| 22 | 9635982160 |
| 23 | 26302324504 |
| 24 | 71674754873 |
| 25 | 195015074610 |
| 26 | 529846108989 |
| 27 | 1437657038030 |
| 28 | 3896050721940 |