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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 12 |
| 7 | 32 |
| 8 | 93 |
| 9 | 279 |
| 10 | 872 |
| 11 | 2830 |
| 12 | 9433 |
| 13 | 32223 |
| 14 | 112527 |
| 15 | 400370 |
| 16 | 1448520 |
| 17 | 5320023 |
| 18 | 19802827 |
| 19 | 74612164 |
| 20 | 284238390 |
| 21 | 1093757436 |
| 22 | 4247742956 |
| 23 | 16636921148 |
| 24 | 65671960544 |
| 25 | 261111950308 |
| 26 | 1045172796381 |
| 27 | 4209807155949 |
| 28 | 17055625810984 |
| 29 | 69476952146529 |
| 30 | 284467866640048 |