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| n | a(n) |
|---|---|
| 1 | 23760 |
| 2 | 59400 |
| 3 | 153720 |
| 4 | 4563000 |
| 5 | 45326160 |
| 6 | 113315400 |
| 7 | 402831360 |
| 8 | 731601000 |
| 9 | 803685120 |
| 10 | 865950624 |
| 11 | 919501200 |
| 12 | 1178491680 |
| 13 | 3504597120 |
| 14 | 3786686400 |
| 15 | 6429564000 |
| 16 | 14924714400 |
| 17 | 25310621952 |
| 18 | 26998616736 |
| 19 | 53138687040 |
| 20 | 86955675840 |
| 21 | 513969369984 |
| 22 | 1054373308800 |
| 23 | 1868445408960 |
[23760,59400,153720,4563000,45326160,113315400, 402831360,731601000,803685120,865950624,919501200, 1178491680,3504597120,3786686400,6429564000, 14924714400,25310621952,26998616736,53138687040, 86955675840,513969369984,1054373308800, 1868445408960] |