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 | 7 |
| 3 | 21 |
| 4 | 66 |
| 5 | 192 |
| 6 | 565 |
| 7 | 1579 |
| 8 | 4348 |
| 9 | 11582 |
| 10 | 30205 |
| 11 | 76736 |
| 12 | 191120 |
| 13 | 465920 |
| 14 | 1115572 |
| 15 | 2623885 |
| 16 | 6074353 |
| 17 | 13849021 |
| 18 | 31137381 |
| 19 | 69082779 |
| 20 | 151390617 |
| 21 | 327897173 |
| 22 | 702426987 |
| 23 | 1489108503 |
| 24 | 3125821257 |
| 25 | 6500086120 |
| 26 | 13396645887 |
| 27 | 27376083598 |
| 28 | 55490121271 |
| 29 | 111604327066 |
| 30 | 222798559100 |