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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 6 |
| 6 | 22 |
| 7 | 64 |
| 8 | 163 |
| 9 | 382 |
| 10 | 848 |
| 11 | 1816 |
| 12 | 3797 |
| 13 | 7814 |
| 14 | 15914 |
| 15 | 32192 |
| 16 | 64839 |
| 17 | 130238 |
| 18 | 261156 |
| 19 | 523128 |
| 20 | 1047225 |
| 21 | 2095590 |
| 22 | 4192510 |
| 23 | 8386560 |
| 24 | 16774891 |
| 25 | 33551806 |
| 26 | 67105912 |
| 27 | 134214424 |
| 28 | 268431773 |
| 29 | 536866822 |
| 30 | 1073737298 |
[0,0,0,0,1,6,22,64,163,382,848,1816,3797,7814, 15914,32192,64839,130238,261156,523128,1047225, 2095590,4192510,8386560,16774891,33551806, 67105912,134214424,268431773,536866822,1073737298] |