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 | 71 |
| 2 | 2485 |
| 3 | 57155 |
| 4 | 971635 |
| 5 | 13019909 |
| 6 | 143218999 |
| 7 | 1329890705 |
| 8 | 10639125640 |
| 9 | 74473879480 |
| 10 | 461738052776 |
| 11 | 2560547383576 |
| 12 | 12802736917880 |
| 13 | 58104729088840 |
| 14 | 240719591939480 |
| 15 | 914734449370024 |
| 16 | 3201570572795084 |
| 17 | 10358022441395860 |
| 18 | 31074067324187580 |