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 | 3 |
| 3 | 58 |
| 4 | 276 |
| 5 | 6325 |
| 6 | 30303 |
| 7 | 695638 |
| 8 | 3333000 |
| 9 | 76513801 |
| 10 | 366599643 |
| 11 | 8415822418 |
| 12 | 40322627676 |
| 13 | 925663952125 |
| 14 | 4435122444663 |
| 15 | 101814618911278 |
| 16 | 487823146285200 |
| 17 | 11198682416288401 |
| 18 | 53656110968927283 |
| 19 | 1231753251172812778 |
| 20 | 5901684383435715876 |
| 21 | 135481658946593117125 |