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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 10 |
| 6 | 20 |
| 7 | 36 |
| 8 | 65 |
| 9 | 129 |
| 10 | 285 |
| 11 | 661 |
| 12 | 1521 |
| 13 | 3394 |
| 14 | 7359 |
| 15 | 15706 |
| 16 | 33457 |
| 17 | 71760 |
| 18 | 155248 |
| 19 | 337745 |
| 20 | 735723 |
| 21 | 1600062 |
| 22 | 3471298 |
| 23 | 7517368 |
| 24 | 16269333 |
| 25 | 35221440 |
| 26 | 76302420 |
| 27 | 165392856 |
| 28 | 358594516 |
| 29 | 777451793 |
| 30 | 1685254125 |
| 31 | 3652428851 |
| 32 | 7915135727 |
| 33 | 17152718719 |
| 34 | 37172960128 |