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 | 2 |
| 2 | 10 |
| 3 | 44 |
| 4 | 377 |
| 5 | 3912 |
| 6 | 57214 |
| 7 | 960808 |
| 8 | 19261862 |
| 9 | 435877584 |
| 10 | 11123320200 |
| 11 | 313842837684 |
| 12 | 9729290348250 |
| 13 | 328114698808288 |
| 14 | 11967567841654610 |
| 15 | 469172063576559648 |
| 16 | 19676848703371278527 |
| 17 | 878942778254232811956 |
| 18 | 41661071646298278566892 |
| 19 | 2088331858752553232964220 |