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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 43 |
| 7 | 603 |
| 8 | 51859 |
| 9 | 62541955 |
| 10 | 6486726488691 |
| 11 | 811385112306041061811 |
| 12 | 10526466601050236861337066646958803 |
| 13 | 17082036570557873538131893815781561362696563088187144467 |
| 14 | 359626974875792367278553795120318710475396935851854517275793126801351587742904492716786003 |
[0,0,1,1,3,7,43,603,51859,62541955,6486726488691, 811385112306041061811, 10526466601050236861337066646958803, 17082036570557873538131893815781561362696563088187\ 144467, 35962697487579236727855379512031871047539693585185\ 4517275793126801351587742904492716786003] |