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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 37 |
| 4 | 138 |
| 5 | 526 |
| 6 | 2030 |
| 7 | 7877 |
| 8 | 30782 |
| 9 | 120726 |
| 10 | 475008 |
| 11 | 1874068 |
| 12 | 7407446 |
| 13 | 29329716 |
| 14 | 116285466 |
| 15 | 461555291 |
| 16 | 1833766116 |
| 17 | 7291280658 |
| 18 | 29011041208 |
| 19 | 115498923044 |
| 20 | 460056287616 |
| 21 | 1833313414216 |
| 22 | 7308504710010 |
| 23 | 29145182257596 |
| 24 | 116260990142440 |
| 25 | 463889711899484 |
| 26 | 1851384051250070 |
| 27 | 7390399587090530 |
[1,3,10,37,138,526,2030,7877,30782,120726,475008, 1874068,7407446,29329716,116285466,461555291, 1833766116,7291280658,29011041208,115498923044, 460056287616,1833313414216,7308504710010, 29145182257596,116260990142440,463889711899484, 1851384051250070,7390399587090530] |