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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 0 |
| 4 | 2 |
| 5 | 4 |
| 6 | 3 |
| 7 | 16 |
| 8 | 19 |
| 9 | 40 |
| 10 | 95 |
| 11 | 136 |
| 12 | 321 |
| 13 | 588 |
| 14 | 1057 |
| 15 | 2240 |
| 16 | 3998 |
| 17 | 7848 |
| 18 | 15339 |
| 19 | 28464 |
| 20 | 56143 |
| 21 | 106788 |
| 22 | 204083 |
| 23 | 396704 |
| 24 | 755052 |
| 25 | 1457456 |
| 26 | 2806531 |
| 27 | 5377112 |
| 28 | 10382243 |
| 29 | 19947252 |
| 30 | 38382957 |
| 31 | 73996576 |
| 32 | 142311198 |
| 33 | 274283168 |
| 34 | 528438319 |
| 35 | 1017784016 |
| 36 | 1962451118 |
| 37 | 3781912684 |
[1,0,2,4,3,16,19,40,95,136,321,588,1057,2240,3998, 7848,15339,28464,56143,106788,204083,396704, 755052,1457456,2806531,5377112,10382243,19947252, 38382957,73996576,142311198,274283168,528438319, 1017784016,1962451118,3781912684] |