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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 46 |
| 5 | 324 |
| 6 | 2608 |
| 7 | 23136 |
| 8 | 221370 |
| 9 | 2252872 |
| 10 | 24153284 |
| 11 | 270922880 |
| 12 | 3163154736 |
| 13 | 38291322000 |
| 14 | 479133266432 |
| 15 | 6181998751808 |
| 16 | 82084129578414 |
| 17 | 1119798740473788 |
| 18 | 15674024566862424 |
| 19 | 224843628257016920 |
| 20 | 3302256609111585300 |
| 21 | 49613275311027132672 |
| 22 | 761926428688868584400 |
| 23 | 11952618573953745931536 |
| 24 | 191418290850831848697272 |
| 25 | 3127755564602007721663352 |
| 26 | 52118116918762815035493760 |
| 27 | 885205781290692080951844800 |
| 28 | 15318116453244882343710519680 |
| 29 | 269953482313408263924956600000 |
[1,2,8,46,324,2608,23136,221370,2252872,24153284, 270922880,3163154736,38291322000,479133266432, 6181998751808,82084129578414,1119798740473788, 15674024566862424,224843628257016920, 3302256609111585300,49613275311027132672, 761926428688868584400,11952618573953745931536, 191418290850831848697272, 3127755564602007721663352, 52118116918762815035493760, 885205781290692080951844800, 15318116453244882343710519680, 269953482313408263924956600000] |