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 | 1 |
| 1 | 6 |
| 2 | 27 |
| 3 | 182 |
| 4 | 987 |
| 5 | 4620 |
| 6 | 20678 |
| 7 | 87732 |
| 8 | 355095 |
| 9 | 1387462 |
| 10 | 5258967 |
| 11 | 19416222 |
| 12 | 70086803 |
| 13 | 248046540 |
| 14 | 862694058 |
| 15 | 2954279732 |
| 16 | 9977518122 |
| 17 | 33278815920 |
| 18 | 109749059308 |
| 19 | 358231786128 |
| 20 | 1158357919194 |
| 21 | 3713416860580 |
| 22 | 11810098024410 |
| 23 | 37285901203740 |
| 24 | 116917784689237 |