A271039 - OEIS

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A271039 as a simple table

n	a(n)
1	642
2	56754
3	2173554
4	50108414
5	804566180
6	9790184488
7	95420380090
8	774600507974
9	5391017644856
10	32890239598008
11	179007489630476
12	881467345491584
13	3972721376352724
14	16545720243662726
15	64195774252619306

[642,56754,2173554,50108414,804566180,9790184488, 95420380090,774600507974,5391017644856, 32890239598008,179007489630476,881467345491584, 3972721376352724,16545720243662726, 64195774252619306]

[642,56754,2173554,50108414,804566180,9790184488,
 95420380090,774600507974,5391017644856,
 32890239598008,179007489630476,881467345491584,
 3972721376352724,16545720243662726,
 64195774252619306]