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 | 2 |
| 1 | 10 |
| 2 | 23 |
| 3 | 50 |
| 4 | 117 |
| 5 | 300 |
| 6 | 823 |
| 7 | 2350 |
| 8 | 6857 |
| 9 | 20240 |
| 10 | 60123 |
| 11 | 179250 |
| 12 | 535597 |
| 13 | 1602580 |
| 14 | 4799423 |
| 15 | 14381750 |
| 16 | 43112337 |
| 17 | 129271320 |
| 18 | 387682723 |
| 19 | 1162785850 |
| 20 | 3487833077 |
| 21 | 10462450460 |
| 22 | 31385254023 |
| 23 | 94151567550 |
| 24 | 282446313817 |
| 25 | 847322164000 |
| 26 | 2541932937323 |
| 27 | 7625731702850 |
| 28 | 22877060890557 |