A233869 - OEIS

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A233869 as a simple table

n	a(n)
1	224
2	1176
3	5984
4	34416
5	189632
6	1128928
7	6414208
8	38622656
9	222041856
10	1341849472
11	7749914112
12	46887986944
13	271306185728
14	1642034355712
15	9508544919552
16	57555613998080
17	333396836184064
18	2018143397804032

[224,1176,5984,34416,189632,1128928,6414208, 38622656,222041856,1341849472,7749914112, 46887986944,271306185728,1642034355712, 9508544919552,57555613998080,333396836184064, 2018143397804032]