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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 4 |
| 5 | 0 |
| 6 | 8 |
| 7 | 32 |
| 8 | 104 |
| 9 | 352 |
| 10 | 1264 |
| 11 | 4480 |
| 12 | 15992 |
| 13 | 57408 |
| 14 | 207152 |
| 15 | 750144 |
| 16 | 2725456 |
| 17 | 9931328 |
| 18 | 36282464 |
| 19 | 132852224 |
| 20 | 487443672 |
| 21 | 1791742592 |
| 22 | 6597006896 |
| 23 | 24326190016 |
| 24 | 89825979568 |
| 25 | 332110462016 |
| 26 | 1229345599520 |
| 27 | 4555536068352 |
| 28 | 16898439030192 |
| 29 | 62743172964224 |
| 30 | 233170424975072 |
| 31 | 867250463225984 |
| 32 | 3228189434389152 |
| 33 | 12025362901992064 |
| 34 | 44827564359795392 |
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