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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 10 |
| 6 | 29 |
| 7 | 67 |
| 8 | 130 |
| 9 | 276 |
| 10 | 618 |
| 11 | 1351 |
| 12 | 3003 |
| 13 | 6743 |
| 14 | 14819 |
| 15 | 32330 |
| 16 | 71269 |
| 17 | 157307 |
| 18 | 346284 |
| 19 | 763698 |
| 20 | 1684996 |
| 21 | 3710825 |
| 22 | 8172131 |
| 23 | 18012691 |
| 24 | 39696783 |
| 25 | 87466867 |
| 26 | 192761407 |
| 27 | 424805801 |
| 28 | 936047353 |
| 29 | 2062639546 |
| 30 | 4545431460 |
| 31 | 10016441028 |
[1,1,2,4,10,29,67,130,276,618,1351,3003,6743, 14819,32330,71269,157307,346284,763698,1684996, 3710825,8172131,18012691,39696783,87466867, 192761407,424805801,936047353,2062639546, 4545431460,10016441028] |