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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 11 |
| 5 | 25 |
| 6 | 60 |
| 7 | 141 |
| 8 | 321 |
| 9 | 742 |
| 10 | 1688 |
| 11 | 3810 |
| 12 | 8580 |
| 13 | 19225 |
| 14 | 42844 |
| 15 | 95156 |
| 16 | 210480 |
| 17 | 463866 |
| 18 | 1018957 |
| 19 | 2231114 |
| 20 | 4870400 |
| 21 | 10601805 |
| 22 | 23015117 |
| 23 | 49833471 |
| 24 | 107636878 |
| 25 | 231940988 |
| 26 | 498671281 |
| 27 | 1069826434 |
| 28 | 2290402343 |
| 29 | 4893782240 |
| 30 | 10436263572 |
| 31 | 22214850439 |
| 32 | 47202869437 |
[1,1,1,5,11,25,60,141,321,742,1688,3810,8580, 19225,42844,95156,210480,463866,1018957,2231114, 4870400,10601805,23015117,49833471,107636878, 231940988,498671281,1069826434,2290402343, 4893782240,10436263572,22214850439,47202869437] |