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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 32 |
| 5 | 106 |
| 6 | 432 |
| 7 | 1606 |
| 8 | 6832 |
| 9 | 26873 |
| 10 | 116447 |
| 11 | 477181 |
| 12 | 2099405 |
| 13 | 8832030 |
| 14 | 39290666 |
| 15 | 168635917 |
| 16 | 756571701 |
| 17 | 3295972568 |
| 18 | 14889850448 |
| 19 | 65634238333 |
| 20 | 298171048021 |
| 21 | 1326776818628 |
| 22 | 6055942572760 |
| 23 | 27155773081241 |
| 24 | 124446022092249 |
| 25 | 561633552368125 |
| 26 | 2582665008550517 |
| 27 | 11719135008399185 |
| 28 | 54052283604222045 |
[1,1,3,8,32,106,432,1606,6832,26873,116447,477181, 2099405,8832030,39290666,168635917,756571701, 3295972568,14889850448,65634238333,298171048021, 1326776818628,6055942572760,27155773081241, 124446022092249,561633552368125,2582665008550517, 11719135008399185,54052283604222045] |