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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 27 |
| 5 | 74 |
| 6 | 311 |
| 7 | 973 |
| 8 | 4225 |
| 9 | 14281 |
| 10 | 63741 |
| 11 | 226243 |
| 12 | 1028848 |
| 13 | 3789405 |
| 14 | 17450224 |
| 15 | 66115864 |
| 16 | 307457417 |
| 17 | 1190882793 |
| 18 | 5580880556 |
| 19 | 22007193489 |
| 20 | 103768034736 |
| 21 | 415307788212 |
| 22 | 1968152808212 |
| 23 | 7975987369231 |
| 24 | 37958127803864 |
| 25 | 155474827122061 |
| 26 | 742557291607324 |
| 27 | 3069658849260929 |
| 28 | 14705810083112145 |
[1,1,3,7,27,74,311,973,4225,14281,63741,226243, 1028848,3789405,17450224,66115864,307457417, 1190882793,5580880556,22007193489,103768034736, 415307788212,1968152808212,7975987369231, 37958127803864,155474827122061,742557291607324, 3069658849260929,14705810083112145] |