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 | 13 |
| 2 | 148 |
| 3 | 1003 |
| 4 | 16141 |
| 5 | 117547 |
| 6 | 917053 |
| 7 | 15502289 |
| 8 | 114274754 |
| 9 | 909482399 |
| 10 | 15471962269 |
| 11 | 115061008452 |
| 12 | 917885746619 |
| 13 | 15675637954053 |
| 14 | 116877859994048 |
| 15 | 933643385166035 |
| 16 | 15975162211603393 |
| 17 | 119196492782053456 |
| 18 | 952870691477908028 |
| 19 | 16319572144410372393 |
| 20 | 121792577413939691253 |