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 | 3 |
| 2 | 54 |
| 3 | 657 |
| 4 | 7276 |
| 5 | 77515 |
| 6 | 807570 |
| 7 | 8288273 |
| 8 | 84146392 |
| 9 | 847289511 |
| 10 | 8476605270 |
| 11 | 84362730441 |
| 12 | 836022413604 |
| 13 | 8255176274787 |
| 14 | 81266247493186 |
| 15 | 797911337890785 |
| 16 | 7816430993273264 |
| 17 | 76417576884235999 |
| 18 | 745777615780501902 |
| 19 | 7266758081613043581 |
| 20 | 70706322844243486380 |
| 21 | 687103929058903836459 |