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 | 21497 |
| 3 | 5493583 |
| 4 | 1441534384 |
| 5 | 376940962215 |
| 6 | 98618371821449 |
| 7 | 25799240154157639 |
| 8 | 6749345823947488233 |
| 9 | 1765694380951147363456 |
| 10 | 461922949276035424430681 |
| 11 | 120843562204869252316712655 |
| 12 | 31613858308925485200467329841 |
| 13 | 8270494656919429771594190182151 |