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 | 4 |
| 3 | 9 |
| 4 | 27 |
| 5 | 61 |
| 6 | 185 |
| 7 | 469 |
| 8 | 1456 |
| 9 | 4368 |
| 10 | 14720 |
| 11 | 50800 |
| 12 | 190149 |
| 13 | 735451 |
| 14 | 3001161 |
| 15 | 12659652 |
| 16 | 55462967 |
| 17 | 250186665 |
| 18 | 1163114375 |
| 19 | 5548002866 |
| 20 | 27151477487 |
| 21 | 135968479892 |
| 22 | 696511087808 |
| 23 | 3643182769117 |
| 24 | 19449907766921 |
| 25 | 105843172596610 |