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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 7 |
| 4 | 20 |
| 5 | 15 |
| 6 | 88 |
| 7 | 31 |
| 8 | 368 |
| 9 | 63 |
| 10 | 1312 |
| 11 | 895 |
| 12 | 5312 |
| 13 | 1791 |
| 14 | 20608 |
| 15 | 2047 |
| 16 | 91904 |
| 17 | 45055 |
| 18 | 289280 |
| 19 | 172031 |
| 20 | 1551360 |
| 21 | 770047 |
| 22 | 4884480 |
| 23 | 2392063 |
| 24 | 19623936 |
| 25 | 16449535 |
| 26 | 67149824 |
| 27 | 31326207 |
| 28 | 294567936 |
| 29 | 113508351 |
| 30 | 1150320640 |
| 31 | 911736831 |
| 32 | 5744558080 |
| 33 | 22020095 |
| 34 | 24031920128 |
[1,1,6,7,20,15,88,31,368,63,1312,895,5312,1791, 20608,2047,91904,45055,289280,172031,1551360, 770047,4884480,2392063,19623936,16449535,67149824, 31326207,294567936,113508351,1150320640,911736831, 5744558080,22020095,24031920128] |