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| n | a(n) |
|---|---|
| 1 | 76 |
| 2 | 684 |
| 3 | 4740 |
| 4 | 35672 |
| 5 | 260172 |
| 6 | 1923780 |
| 7 | 14150114 |
| 8 | 104300522 |
| 9 | 768160718 |
| 10 | 5659345888 |
| 11 | 41689048326 |
| 12 | 307115065572 |
| 13 | 2262407666898 |
| 14 | 16666499139956 |
| 15 | 122776828884698 |
| 16 | 904459332925242 |
| 17 | 6662871472736956 |
| 18 | 49083319176509768 |
[76,684,4740,35672,260172,1923780,14150114, 104300522,768160718,5659345888,41689048326, 307115065572,2262407666898,16666499139956, 122776828884698,904459332925242,6662871472736956, 49083319176509768] |