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A291000 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 26 |
| 4 | 74 |
| 5 | 210 |
| 6 | 596 |
| 7 | 1692 |
| 8 | 4804 |
| 9 | 13640 |
| 10 | 38728 |
| 11 | 109960 |
| 12 | 312208 |
| 13 | 886448 |
| 14 | 2516880 |
| 15 | 7146144 |
| 16 | 20289952 |
| 17 | 57608992 |
| 18 | 163568448 |
| 19 | 464417728 |
| 20 | 1318615104 |
| 21 | 3743926400 |
| 22 | 10630080640 |
| 23 | 30181847168 |
| 24 | 85694918912 |
| 25 | 243312448256 |
| 26 | 690833811712 |
| 27 | 1961475291648 |
| 28 | 5569190816256 |
[1,3,9,26,74,210,596,1692,4804,13640,38728,109960, 312208,886448,2516880,7146144,20289952,57608992, 163568448,464417728,1318615104,3743926400, 10630080640,30181847168,85694918912,243312448256, 690833811712,1961475291648,5569190816256] |