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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 3 |
| 3 | 77 |
| 4 | 1777 |
| 5 | 41088 |
| 6 | 964199 |
| 7 | 22962721 |
| 8 | 553886872 |
| 9 | 13504654074 |
| 10 | 332253097450 |
| 11 | 8237141855085 |
| 12 | 205552200503455 |
| 13 | 5158397884289338 |
| 14 | 130087682458168777 |
| 15 | 3294763277704155587 |
| 16 | 83764781257030939439 |
| 17 | 2136808562574516060202 |
| 18 | 54674217200832983666877 |
[0,0,3,77,1777,41088,964199,22962721,553886872, 13504654074,332253097450,8237141855085, 205552200503455,5158397884289338, 130087682458168777,3294763277704155587, 83764781257030939439,2136808562574516060202, 54674217200832983666877] |