A017431 - OEIS

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A017431 as a simple table

n	a(n)
0	2187
1	105413504
2	6103515625
3	78364164096
4	506623120463
5	2207984167552
6	7446353252589
7	20971520000000
8	51676101935731
9	114868566764928
10	235260548044817
11	450766669594624
12	817215093984375
13	1414067010444416

[2187,105413504,6103515625,78364164096, 506623120463,2207984167552,7446353252589, 20971520000000,51676101935731,114868566764928, 235260548044817,450766669594624,817215093984375, 1414067010444416]