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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 6 |
| 8 | 13 |
| 9 | 25 |
| 10 | 55 |
| 11 | 107 |
| 12 | 224 |
| 13 | 454 |
| 14 | 938 |
| 15 | 1916 |
| 16 | 3969 |
| 17 | 8163 |
| 18 | 16918 |
| 19 | 35010 |
| 20 | 72724 |
| 21 | 151093 |
| 22 | 314749 |
| 23 | 656115 |
| 24 | 1370348 |
| 25 | 2864948 |
| 26 | 5998547 |
| 27 | 12572884 |
| 28 | 26385837 |
| 29 | 55431031 |
| 30 | 116577538 |
| 31 | 245415158 |
| 32 | 517152607 |
| 33 | 1090771973 |
| 34 | 2302729115 |
| 35 | 4865449045 |
| 36 | 10288826434 |
| 37 | 21774842539 |
[1,1,3,6,13,25,55,107,224,454,938,1916,3969,8163, 16918,35010,72724,151093,314749,656115,1370348, 2864948,5998547,12572884,26385837,55431031, 116577538,245415158,517152607,1090771973, 2302729115,4865449045,10288826434,21774842539] |