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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 4 |
| 6 | 12 |
| 7 | 32 |
| 8 | 79 |
| 9 | 186 |
| 10 | 424 |
| 11 | 944 |
| 12 | 2065 |
| 13 | 4456 |
| 14 | 9512 |
| 15 | 20128 |
| 16 | 42287 |
| 17 | 88310 |
| 18 | 183492 |
| 19 | 379624 |
| 20 | 782497 |
| 21 | 1607756 |
| 22 | 3294164 |
| 23 | 6732992 |
| 24 | 13732063 |
| 25 | 27953522 |
| 26 | 56807184 |
| 27 | 115269984 |
| 28 | 233585121 |
| 29 | 472771152 |
| 30 | 955843984 |
| 31 | 1930635712 |
| 32 | 3896121759 |
| 33 | 7856343278 |
| 34 | 15830584396 |
[0,0,0,0,1,4,12,32,79,186,424,944,2065,4456,9512, 20128,42287,88310,183492,379624,782497,1607756, 3294164,6732992,13732063,27953522,56807184, 115269984,233585121,472771152,955843984, 1930635712,3896121759,7856343278,15830584396] |