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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 25 |
| 4 | 71 |
| 5 | 201 |
| 6 | 573 |
| 7 | 1635 |
| 8 | 4677 |
| 9 | 13399 |
| 10 | 38457 |
| 11 | 110559 |
| 12 | 318375 |
| 13 | 918281 |
| 14 | 2652687 |
| 15 | 7674389 |
| 16 | 22234411 |
| 17 | 64506957 |
| 18 | 187396863 |
| 19 | 545090409 |
| 20 | 1587454407 |
| 21 | 4628463753 |
| 22 | 13509904359 |
| 23 | 39475258065 |
| 24 | 115460419701 |
| 25 | 338030276619 |
| 26 | 990539965197 |
| 27 | 2905111047127 |
| 28 | 8527250269257 |
| 29 | 25049140759647 |
| 30 | 73637161597765 |
[1,3,9,25,71,201,573,1635,4677,13399,38457,110559, 318375,918281,2652687,7674389,22234411,64506957, 187396863,545090409,1587454407,4628463753, 13509904359,39475258065,115460419701,338030276619, 990539965197,2905111047127,8527250269257, 25049140759647,73637161597765] |