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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 39 |
| 3 | 244 |
| 4 | 1109 |
| 5 | 6031 |
| 6 | 28448 |
| 7 | 136778 |
| 8 | 633328 |
| 9 | 2905016 |
| 10 | 13118016 |
| 11 | 58633648 |
| 12 | 259523840 |
| 13 | 1139461984 |
| 14 | 4967050352 |
| 15 | 21516000592 |
| 16 | 92679568016 |
| 17 | 397212173264 |
| 18 | 1694694809008 |
| 19 | 7200709256752 |
| 20 | 30481238674128 |
| 21 | 128588345884944 |
[0,39,244,1109,6031,28448,136778,633328,2905016, 13118016,58633648,259523840,1139461984,4967050352, 21516000592,92679568016,397212173264, 1694694809008,7200709256752,30481238674128, 128588345884944] |