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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 4 |
| 5 | 42 |
| 6 | 9050 |
| 7 | 6965359 |
| 8 | 26721852461 |
| 9 | 429651752290375 |
| 10 | 31194475941824888769 |
| 11 | 9828395457980805457337560 |
| 12 | 13684686862375136981850903785368 |
| 13 | 83297108604256429529069019958551956425 |
| 14 | 2226741508593975401942934273354241209226704830 |
| 15 | 260577257822688861848154672171293101310412373160498171 |
| 16 | 133631198381015786582155688877301469836628906260462969996612568 |
| 17 | 299985729493560746632648983353916422875677601725131683097521792924081609 |
[1,1,0,4,42,9050,6965359,26721852461, 429651752290375,31194475941824888769, 9828395457980805457337560, 13684686862375136981850903785368, 83297108604256429529069019958551956425, 2226741508593975401942934273354241209226704830, 26057725782268886184815467217129310131041237316049\ 8171, 13363119838101578658215568887730146983662890626046\ 2969996612568, 29998572949356074663264898335391642287567760172513\ 1683097521792924081609] |