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 | 78 |
| 2 | 3003 |
| 3 | 76076 |
| 4 | 1426425 |
| 5 | 21111090 |
| 6 | 256851595 |
| 7 | 2641902120 |
| 8 | 23446881315 |
| 9 | 182364632450 |
| 10 | 1258315963905 |
| 11 | 7778680504140 |
| 12 | 43430966148115 |
| 13 | 220495674290430 |
| 14 | 1023729916348425 |
| 15 | 4367914309753280 |
| 16 | 17198662594653540 |
| 17 | 62724534168736440 |
| 18 | 212566476905162380 |