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A027994 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 16 |
| 4 | 43 |
| 5 | 114 |
| 6 | 301 |
| 7 | 792 |
| 8 | 2080 |
| 9 | 5456 |
| 10 | 14301 |
| 11 | 37468 |
| 12 | 98137 |
| 13 | 256998 |
| 14 | 672946 |
| 15 | 1761984 |
| 16 | 4613239 |
| 17 | 12078110 |
| 18 | 31621701 |
| 19 | 82787980 |
| 20 | 216743836 |
| 21 | 567446112 |
| 22 | 1485598681 |
| 23 | 3889356696 |
| 24 | 10182482353 |
| 25 | 26658108074 |
| 26 | 69791870526 |
| 27 | 182717549872 |
[1,2,6,16,43,114,301,792,2080,5456,14301,37468, 98137,256998,672946,1761984,4613239,12078110, 31621701,82787980,216743836,567446112,1485598681, 3889356696,10182482353,26658108074,69791870526, 182717549872] |