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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 19 |
| 5 | 49 |
| 6 | 112 |
| 7 | 273 |
| 8 | 631 |
| 9 | 1450 |
| 10 | 3327 |
| 11 | 7571 |
| 12 | 17170 |
| 13 | 38519 |
| 14 | 85951 |
| 15 | 190392 |
| 16 | 419759 |
| 17 | 921189 |
| 18 | 2013874 |
| 19 | 4385889 |
| 20 | 9516273 |
| 21 | 20577618 |
| 22 | 44352499 |
| 23 | 95324853 |
| 24 | 204307052 |
| 25 | 436768151 |
| 26 | 931448065 |
| 27 | 1981879262 |
| 28 | 4207887155 |
| 29 | 8916102661 |
| 30 | 18856430826 |
| 31 | 39807226901 |
| 32 | 83892649091 |
[1,1,3,8,19,49,112,273,631,1450,3327,7571,17170, 38519,85951,190392,419759,921189,2013874,4385889, 9516273,20577618,44352499,95324853,204307052, 436768151,931448065,1981879262,4207887155, 8916102661,18856430826,39807226901,83892649091] |