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 | 12 |
| 2 | 276 |
| 3 | 7140 |
| 4 | 194580 |
| 5 | 5461512 |
| 6 | 156238908 |
| 7 | 4529365776 |
| 8 | 132601016340 |
| 9 | 3911395881900 |
| 10 | 116068178638776 |
| 11 | 3461014728350400 |
| 12 | 103619293824707388 |
| 13 | 3112781199432937200 |
| 14 | 93780365051563029360 |
| 15 | 2832430653037446854640 |
| 16 | 85733828145510955528212 |
| 17 | 2600022926684976508835280 |