A134048 - OEIS

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A134048 as a simple table

n	a(n)
0	1
1	4
2	28
3	548
4	35108
5	7507972
6	5383397764
7	13122109416964
8	110735166982705668
9	3291956693540520243204
10	349880644048154072353961988
11	134569675810924626719483447943172

[1,4,28,548,35108,7507972,5383397764, 13122109416964,110735166982705668, 3291956693540520243204, 349880644048154072353961988, 134569675810924626719483447943172]