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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 14 |
| 7 | 35 |
| 8 | 97 |
| 9 | 264 |
| 10 | 733 |
| 11 | 2034 |
| 12 | 5728 |
| 13 | 16101 |
| 14 | 45595 |
| 15 | 129327 |
| 16 | 368093 |
| 17 | 1049520 |
| 18 | 2999415 |
| 19 | 8584857 |
| 20 | 24612114 |
| 21 | 70652441 |
| 22 | 203075740 |
| 23 | 584339171 |
| 24 | 1683151508 |
| 25 | 4852736072 |
| 26 | 14003298194 |
| 27 | 40441136815 |
| 28 | 116880901512 |
| 29 | 338040071375 |
| 30 | 978314772989 |
| 31 | 2833067885748 |
| 32 | 8208952443400 |
[1,0,0,1,2,5,14,35,97,264,733,2034,5728,16101, 45595,129327,368093,1049520,2999415,8584857, 24612114,70652441,203075740,584339171,1683151508, 4852736072,14003298194,40441136815,116880901512, 338040071375,978314772989,2833067885748, 8208952443400] |