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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 4 |
| 6 | 6 |
| 7 | 4 |
| 8 | 14 |
| 9 | 58 |
| 10 | 92 |
| 11 | 210 |
| 12 | 634 |
| 13 | 1502 |
| 14 | 3394 |
| 15 | 9168 |
| 16 | 23090 |
| 17 | 57376 |
| 18 | 148201 |
| 19 | 387626 |
| 20 | 999878 |
| 21 | 2611796 |
| 22 | 6901985 |
| 23 | 18213420 |
| 24 | 48189019 |
| 25 | 128283468 |
| 26 | 342172298 |
| 27 | 913765356 |
| 28 | 2447082537 |
| 29 | 6567061364 |
| 30 | 17646783586 |
| 31 | 47498319984 |
[0,0,4,6,4,14,58,92,210,634,1502,3394,9168,23090, 57376,148201,387626,999878,2611796,6901985, 18213420,48189019,128283468,342172298,913765356, 2447082537,6567061364,17646783586,47498319984] |