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 | 1 |
| 2 | 151 |
| 3 | 4561 |
| 4 | 49981 |
| 5 | 315121 |
| 6 | 1406371 |
| 7 | 4956001 |
| 8 | 14709241 |
| 9 | 38316961 |
| 10 | 90090991 |
| 11 | 195019441 |
| 12 | 394379701 |
| 13 | 753327121 |
| 14 | 1370877691 |
| 15 | 2392743361 |
| 16 | 4027518961 |
| 17 | 6566760001 |
| 18 | 10409530951 |
| 19 | 16092043921 |
| 20 | 24323047981 |
| 21 | 36025669681 |
| 22 | 52386445651 |
| 23 | 74912328481 |
| 24 | 105496487401 |
| 25 | 146493765601 |