A038223 - OEIS

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A038223 as a simple table

n	a(n)
0	1
1	6
2	31
3	157
4	793
5	4004
6	20216
7	102069
8	515338
9	2601899
10	13136773
11	66326481
12	334876920
13	1690765888
14	8536537209
15	43100270734
16	217609704247
17	1098693409021
18	5547212203625
19	28007415880892
20	141407127676248

[1,6,31,157,793,4004,20216,102069,515338,2601899, 13136773,66326481,334876920,1690765888,8536537209, 43100270734,217609704247,1098693409021, 5547212203625,28007415880892,141407127676248]