A213722 - OEIS

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A213722 as a simple table

n	a(n)
0	0
1	0
2	0
3	1
4	3
5	7
6	15
7	34
8	74
9	158
10	333
11	694
12	1434
13	2946
14	6030
15	12312
16	25090
17	51040
18	103654
19	210165
20	425488
21	860267
22	1737263
23	3504655
24	7063602
25	14225185
26	28627843
27	57579313

[0,0,0,1,3,7,15,34,74,158,333,694,1434,2946,6030, 12312,25090,51040,103654,210165,425488,860267, 1737263,3504655,7063602,14225185,28627843, 57579313]