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 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 34 |
| 4 | 386 |
| 5 | 6940 |
| 6 | 221672 |
| 7 | 12582472 |
| 8 | 1293374998 |
| 9 | 242394178200 |
| 10 | 83374069529638 |
| 11 | 52845726291860344 |
| 12 | 61928161880183204434 |
| 13 | 134499571879749571406816 |
| 14 | 542432658409586214809714176 |
| 15 | 4068438590479352629770422328000 |
| 16 | 56820656114941381799512710314429768 |