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) |
|---|---|
| 1 | 2 |
| 2 | 10 |
| 3 | 36 |
| 4 | 120 |
| 5 | 382 |
| 6 | 1178 |
| 7 | 3550 |
| 8 | 10514 |
| 9 | 30720 |
| 10 | 88788 |
| 11 | 254342 |
| 12 | 723190 |
| 13 | 2043386 |
| 14 | 5742490 |
| 15 | 16062492 |
| 16 | 44744688 |
| 17 | 124192270 |
| 18 | 343594514 |
| 19 | 947857750 |
| 20 | 2608015778 |
| 21 | 7159034232 |
| 22 | 19609583820 |
| 23 | 53608363286 |
| 24 | 146290947310 |
| 25 | 398552156402 |
| 26 | 1084153113898 |
| 27 | 2944982283540 |
| 28 | 7989231439464 |
| 29 | 21646950044830 |
| 30 | 58585895022218 |
| 31 | 158389325993422 |