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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 132 |
| 4 | 7156 |
| 5 | 729895 |
| 6 | 119636226 |
| 7 | 28619359629 |
| 8 | 9374688646296 |
| 9 | 4019108763468573 |
| 10 | 2180474045020534600 |
| 11 | 1458451073246597456521 |
| 12 | 1177921104348705716833164 |
| 13 | 1129393220849450436646366223 |
| 14 | 1267471534789127127256106086245 |
[1,1,6,132,7156,729895,119636226,28619359629, 9374688646296,4019108763468573, 2180474045020534600,1458451073246597456521, 1177921104348705716833164, 1129393220849450436646366223, 1267471534789127127256106086245] |