A048663 - OEIS

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A048663 as a simple table

n	a(n)
1	1
2	6
3	45
4	344
5	2670
6	20886
7	164514
8	1303304
9	10375830
10	82947380
11	665440039
12	5354470860
13	43196001173
14	349254823554
15	2829388506690
16	22961191276080
17	186622811691276
18	1518914831183982
19	12377727000122043

[1,6,45,344,2670,20886,164514,1303304,10375830, 82947380,665440039,5354470860,43196001173, 349254823554,2829388506690,22961191276080, 186622811691276,1518914831183982, 12377727000122043]