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 | 394 |
| 2 | 1392 |
| 3 | 5248 |
| 4 | 20940 |
| 5 | 87784 |
| 6 | 384252 |
| 7 | 1747048 |
| 8 | 8213820 |
| 9 | 39780424 |
| 10 | 197799612 |
| 11 | 1006785448 |
| 12 | 5232061500 |
| 13 | 27696448264 |
| 14 | 149034102972 |
| 15 | 813659961448 |
| 16 | 4499466577980 |
| 17 | 25163809551304 |
| 18 | 142131488326332 |
| 19 | 809773455691048 |
| 20 | 4648490027827260 |
| 21 | 26859776918289544 |