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 | 21 |
| 3 | 610 |
| 4 | 25585 |
| 5 | 1410003 |
| 6 | 96451278 |
| 7 | 7886294988 |
| 8 | 750477171015 |
| 9 | 81489964671115 |
| 10 | 9943628857101511 |
| 11 | 1347093605732587986 |
| 12 | 200625344191782743506 |
| 13 | 32581061387048389884550 |
| 14 | 5729971899859216832319300 |
| 15 | 1084929313931423899784882280 |
| 16 | 220046254343980047765630634905 |