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 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 40 |
| 5 | 211 |
| 6 | 1148 |
| 7 | 6369 |
| 8 | 35816 |
| 9 | 203424 |
| 10 | 1164228 |
| 11 | 6703372 |
| 12 | 38785840 |
| 13 | 225325940 |
| 14 | 1313494396 |
| 15 | 7679038865 |
| 16 | 45006411960 |
| 17 | 264357297375 |
| 18 | 1555762562100 |
| 19 | 9171399730944 |
| 20 | 54148782940112 |
| 21 | 320136500713070 |
| 22 | 1895036382245032 |
| 23 | 11230166960501463 |
| 24 | 66619011999761208 |
| 25 | 395563260817743219 |