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 | 3 |
| 3 | 11 |
| 4 | 44 |
| 5 | 221 |
| 6 | 1326 |
| 7 | 9286 |
| 8 | 74288 |
| 9 | 668598 |
| 10 | 6685982 |
| 11 | 73545804 |
| 12 | 882549650 |
| 13 | 11473145461 |
| 14 | 160624036454 |
| 15 | 2409360546814 |
| 16 | 38549768749031 |
| 17 | 655346068733532 |
| 18 | 11796229237203591 |
| 19 | 224128355506868246 |
| 20 | 4482567110137364921 |
| 21 | 94133909312884663355 |
| 22 | 2070946004883462593813 |