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 | 10 |
| 1 | 40 |
| 2 | 160 |
| 3 | 640 |
| 4 | 2560 |
| 5 | 10240 |
| 6 | 40960 |
| 7 | 163840 |
| 8 | 655360 |
| 9 | 2621440 |
| 10 | 10485760 |
| 11 | 41943040 |
| 12 | 167772160 |
| 13 | 671088640 |
| 14 | 2684354560 |
| 15 | 10737418240 |
| 16 | 42949672960 |
| 17 | 171798691840 |
| 18 | 687194767360 |
| 19 | 2748779069440 |
| 20 | 10995116277760 |
| 21 | 43980465111040 |
| 22 | 175921860444160 |
| 23 | 703687441776640 |
| 24 | 2814749767106560 |