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 | 7 |
| 3 | 44 |
| 4 | 350 |
| 5 | 2658 |
| 6 | 20386 |
| 7 | 156098 |
| 8 | 1195561 |
| 9 | 9156379 |
| 10 | 70126074 |
| 11 | 537074685 |
| 12 | 4113296146 |
| 13 | 31502516844 |
| 14 | 241268447450 |
| 15 | 1847803587081 |
| 16 | 14151780448318 |
| 17 | 108384295414048 |
| 18 | 830083220654363 |
| 19 | 6357361558503534 |
| 20 | 48689149448999134 |