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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 12 |
| 3 | 244 |
| 4 | 7084 |
| 5 | 268716 |
| 6 | 12618616 |
| 7 | 707542312 |
| 8 | 46164369504 |
| 9 | 3437762234464 |
| 10 | 287830529920576 |
| 11 | 26772093907478976 |
| 12 | 2739431829975444352 |
| 13 | 305869238654653788544 |
| 14 | 37010335831481152199424 |
| 15 | 4824682223713815167769856 |
| 16 | 674162053956687816905529856 |
| 17 | 100526605452826479060450949632 |
[1,1,12,244,7084,268716,12618616,707542312, 46164369504,3437762234464,287830529920576, 26772093907478976,2739431829975444352, 305869238654653788544,37010335831481152199424, 4824682223713815167769856, 674162053956687816905529856, 100526605452826479060450949632] |