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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 8 |
| 7 | 20 |
| 8 | 46 |
| 9 | 96 |
| 10 | 197 |
| 11 | 404 |
| 12 | 798 |
| 13 | 1599 |
| 14 | 3134 |
| 15 | 6169 |
| 16 | 12093 |
| 17 | 23640 |
| 18 | 46199 |
| 19 | 90180 |
| 20 | 176198 |
| 21 | 343927 |
| 22 | 671783 |
| 23 | 1312304 |
| 24 | 2564485 |
| 25 | 5012807 |
| 26 | 9803883 |
| 27 | 19181677 |
| 28 | 37545265 |
| 29 | 73524262 |
| 30 | 144038812 |
| 31 | 282313035 |
| 32 | 553557959 |
| 33 | 1085860455 |
| 34 | 2130904274 |
| 35 | 4183364732 |
| 36 | 8215861037 |
[0,0,0,1,2,8,20,46,96,197,404,798,1599,3134,6169, 12093,23640,46199,90180,176198,343927,671783, 1312304,2564485,5012807,9803883,19181677,37545265, 73524262,144038812,282313035,553557959,1085860455, 2130904274,4183364732,8215861037] |