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) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 22 |
| 3 | 190 |
| 4 | 2239 |
| 5 | 32431 |
| 6 | 546832 |
| 7 | 10414132 |
| 8 | 219845677 |
| 9 | 5079617326 |
| 10 | 127292440606 |
| 11 | 3435881715553 |
| 12 | 99351006910147 |
| 13 | 3063829146597493 |
| 14 | 100385767850729656 |
| 15 | 3483114440490487576 |
| 16 | 127610457725933245753 |
| 17 | 4923678697863463464970 |
| 18 | 199592119100636938629838 |