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 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 118 |
| 6 | 534 |
| 7 | 1851 |
| 8 | 5158 |
| 9 | 12264 |
| 10 | 25943 |
| 11 | 50214 |
| 12 | 90656 |
| 13 | 154758 |
| 14 | 252304 |
| 15 | 395793 |
| 16 | 600894 |
| 17 | 886936 |
| 18 | 1277433 |
| 19 | 1800644 |
| 20 | 2490168 |
| 21 | 3385574 |
| 22 | 4533066 |
| 23 | 5986183 |
| 24 | 7806534 |
| 25 | 10064568 |
| 26 | 12840379 |
| 27 | 16224546 |
| 28 | 20319008 |
| 29 | 25237974 |
| 30 | 31108868 |
| 31 | 38073309 |
| 32 | 46288126 |
| 33 | 55926408 |