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 | 1 |
| 2 | 21 |
| 3 | 546 |
| 4 | 15561 |
| 5 | 466830 |
| 6 | 14471730 |
| 7 | 458960580 |
| 8 | 14801478705 |
| 9 | 483514971030 |
| 10 | 15955994043990 |
| 11 | 530899438190940 |
| 12 | 17785131179396490 |
| 13 | 599222112044281740 |
| 14 | 20287948650642110340 |
| 15 | 689790254121831751560 |
| 16 | 23539092421907508521985 |
| 17 | 805867752326480585870310 |
| 18 | 27668126163209166781547310 |