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 | 16 |
| 2 | 256 |
| 3 | 420 |
| 4 | 1866 |
| 5 | 7500 |
| 6 | 27762 |
| 7 | 106110 |
| 8 | 413526 |
| 9 | 1583234 |
| 10 | 6065840 |
| 11 | 23380612 |
| 12 | 89904320 |
| 13 | 345225042 |
| 14 | 1327292244 |
| 15 | 5103379268 |
| 16 | 19613888918 |
| 17 | 75392090306 |
| 18 | 289821707064 |
| 19 | 1114041030214 |
| 20 | 4282214237068 |
| 21 | 16460713051026 |
| 22 | 63274053473750 |