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A218959
as a simple table
n
a(n)
0
1
1
1
2
1
3
4
4
7
5
31
6
211
7
1156
8
5419
9
40027
10
348331
11
3204796
12
38422891
13
467645179
[1,1,1,4,7,31,211,1156,5419,40027,348331,3204796, 38422891,467645179]