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A027133 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 23 |
| 5 | 59 |
| 6 | 155 |
| 7 | 429 |
| 8 | 1188 |
| 9 | 3298 |
| 10 | 9181 |
| 11 | 25634 |
| 12 | 71781 |
| 13 | 201569 |
| 14 | 571795 |
| 15 | 1639244 |
| 16 | 4702499 |
| 17 | 13500396 |
| 18 | 38790727 |
| 19 | 111555296 |
| 20 | 321100627 |
| 21 | 925086012 |
| 22 | 2667533646 |
| 23 | 7698716068 |
| 24 | 22238169212 |
| 25 | 64473303788 |
| 26 | 187912261301 |
| 27 | 547850119836 |
[1,2,4,9,23,59,155,429,1188,3298,9181,25634,71781, 201569,571795,1639244,4702499,13500396,38790727, 111555296,321100627,925086012,2667533646, 7698716068,22238169212,64473303788,187912261301, 547850119836] |