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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 25 |
| 4 | 60 |
| 5 | 147 |
| 6 | 336 |
| 7 | 882 |
| 8 | 1960 |
| 9 | 4631 |
| 10 | 10104 |
| 11 | 25207 |
| 12 | 54292 |
| 13 | 125895 |
| 14 | 268576 |
| 15 | 653191 |
| 16 | 1383228 |
| 17 | 3172981 |
| 18 | 6679960 |
| 19 | 15996204 |
| 20 | 33515856 |
| 21 | 76350225 |
| 22 | 159339600 |
| 23 | 377580850 |
| 24 | 785368168 |
| 25 | 1780545051 |
| 26 | 3692982328 |
| 27 | 8684805392 |
| 28 | 17968562880 |
[1,3,8,25,60,147,336,882,1960,4631,10104,25207, 54292,125895,268576,653191,1383228,3172981, 6679960,15996204,33515856,76350225,159339600, 377580850,785368168,1780545051,3692982328, 8684805392,17968562880] |