A202509 - OEIS

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A202509 as a simple table

n	a(n)
1	1
2	7
3	47
4	217
5	1041
6	5429
7	29295
8	161469
9	890659
10	4953959
11	27653867
12	154912145
13	870424381
14	4906927687
15	27742701519
16	157251702011
17	893270398075
18	5083772866943
19	28979759201581
20	165434751255111
21	945621770041509

[1,7,47,217,1041,5429,29295,161469,890659,4953959, 27653867,154912145,870424381,4906927687, 27742701519,157251702011,893270398075, 5083772866943,28979759201581,165434751255111, 945621770041509]