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 | 30 |
| 2 | 465 |
| 3 | 4959 |
| 4 | 40890 |
| 5 | 277791 |
| 6 | 1618199 |
| 7 | 8306730 |
| 8 | 38329299 |
| 9 | 161383520 |
| 10 | 627356796 |
| 11 | 2272915164 |
| 12 | 7734020120 |
| 13 | 24874638204 |
| 14 | 76028550900 |
| 15 | 221849950497 |
| 16 | 620471946324 |
| 17 | 1669004265525 |
| 18 | 4330837858674 |
| 19 | 10869702783150 |
| 20 | 26449453637412 |