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 | 5 |
| 2 | 10 |
| 3 | 40 |
| 4 | 70 |
| 5 | 250 |
| 6 | 430 |
| 7 | 1510 |
| 8 | 2590 |
| 9 | 9070 |
| 10 | 15550 |
| 11 | 54430 |
| 12 | 93310 |
| 13 | 326590 |
| 14 | 559870 |
| 15 | 1959550 |
| 16 | 3359230 |
| 17 | 11757310 |
| 18 | 20155390 |
| 19 | 70543870 |
| 20 | 120932350 |
| 21 | 423263230 |
| 22 | 725594110 |
| 23 | 2539579390 |
| 24 | 4353564670 |
| 25 | 15237476350 |
| 26 | 26121388030 |
| 27 | 91424858110 |
| 28 | 156728328190 |
| 29 | 548549148670 |