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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 7 |
| 4 | 24 |
| 5 | 15 |
| 6 | 120 |
| 7 | 47 |
| 8 | 416 |
| 9 | 63 |
| 10 | 1536 |
| 11 | 2047 |
| 12 | 6912 |
| 13 | 2559 |
| 14 | 28032 |
| 15 | 511 |
| 16 | 99840 |
| 17 | 131071 |
| 18 | 417792 |
| 19 | 227327 |
| 20 | 2078720 |
| 21 | 794623 |
| 22 | 6840320 |
| 23 | 4169727 |
| 24 | 25681920 |
| 25 | 14811135 |
| 26 | 115113984 |
| 27 | 47644671 |
| 28 | 458227712 |
| 29 | 50593791 |
| 30 | 1612414976 |
| 31 | 2112749567 |
| 32 | 7758282752 |
| 33 | 1882718207 |
[1,1,6,7,24,15,120,47,416,63,1536,2047,6912,2559, 28032,511,99840,131071,417792,227327,2078720, 794623,6840320,4169727,25681920,14811135, 115113984,47644671,458227712,50593791,1612414976, 2112749567,7758282752,1882718207] |