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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 29 |
| 5 | 97 |
| 6 | 356 |
| 7 | 1345 |
| 8 | 5312 |
| 9 | 20951 |
| 10 | 84910 |
| 11 | 349614 |
| 12 | 1456834 |
| 13 | 6106706 |
| 14 | 25935852 |
| 15 | 111040569 |
| 16 | 477930029 |
| 17 | 2069560858 |
| 18 | 9025183157 |
| 19 | 39530097395 |
| 20 | 173797714040 |
| 21 | 767680927436 |
| 22 | 3404799777699 |
| 23 | 15144014386727 |
| 24 | 67566885275210 |
| 25 | 302450951239750 |
| 26 | 1357363670407487 |
| 27 | 6105291074781927 |
| 28 | 27528978458057805 |
[1,1,3,8,29,97,356,1345,5312,20951,84910,349614, 1456834,6106706,25935852,111040569,477930029, 2069560858,9025183157,39530097395,173797714040, 767680927436,3404799777699,15144014386727, 67566885275210,302450951239750,1357363670407487, 6105291074781927,27528978458057805] |