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 | 1 |
| 2 | 33 |
| 3 | 340 |
| 4 | 5261 |
| 5 | 104116 |
| 6 | 2133397 |
| 7 | 49873552 |
| 8 | 1290339353 |
| 9 | 35858779408 |
| 10 | 1073946466601 |
| 11 | 34411135594144 |
| 12 | 1169673799665637 |
| 13 | 42024908270673472 |
| 14 | 1589960095129885949 |
| 15 | 63097191029229655456 |
| 16 | 2618689624916494795313 |
| 17 | 113366790415884862467328 |
| 18 | 5107030221925521874906705 |