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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 41 |
| 5 | 150 |
| 6 | 568 |
| 7 | 2173 |
| 8 | 8481 |
| 9 | 33756 |
| 10 | 135463 |
| 11 | 547375 |
| 12 | 2233624 |
| 13 | 9174167 |
| 14 | 37848374 |
| 15 | 156914675 |
| 16 | 653597162 |
| 17 | 2731737145 |
| 18 | 11452844102 |
| 19 | 48166309663 |
| 20 | 203115207619 |
| 21 | 858494466299 |
| 22 | 3636552361349 |
| 23 | 15436162344558 |
| 24 | 65641966321937 |
| 25 | 279610928461517 |
| 26 | 1192948785566952 |
| 27 | 5097192013993835 |
[1,1,4,12,41,150,568,2173,8481,33756,135463, 547375,2233624,9174167,37848374,156914675, 653597162,2731737145,11452844102,48166309663, 203115207619,858494466299,3636552361349, 15436162344558,65641966321937,279610928461517, 1192948785566952,5097192013993835] |