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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 5 |
| 7 | 6 |
| 8 | 15 |
| 9 | 22 |
| 10 | 51 |
| 11 | 86 |
| 12 | 195 |
| 13 | 354 |
| 14 | 781 |
| 15 | 1512 |
| 16 | 3286 |
| 17 | 6602 |
| 18 | 14269 |
| 19 | 29424 |
| 20 | 63494 |
| 21 | 133298 |
| 22 | 287909 |
| 23 | 612188 |
| 24 | 1325375 |
| 25 | 2844448 |
| 26 | 6176145 |
| 27 | 13348858 |
| 28 | 29074164 |
| 29 | 63187176 |
| 30 | 138044144 |
| 31 | 301350424 |
| 32 | 660265471 |
| 33 | 1446678326 |
| 34 | 3178246273 |
| 35 | 6985464590 |
| 36 | 15384556290 |
[0,1,1,2,2,5,6,15,22,51,86,195,354,781,1512,3286, 6602,14269,29424,63494,133298,287909,612188, 1325375,2844448,6176145,13348858,29074164, 63187176,138044144,301350424,660265471,1446678326, 3178246273,6985464590,15384556290] |