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A180890 as a simple table

na(n)
11
20
32
46
520
690
7550
83512
925378
10200558
111778156
1217016488
13177741892
141984308356
1523873823014
16304944376412
174155112842840

[1,0,2,6,20,90,550,3512,25378,200558,1778156,
 17016488,177741892,1984308356,23873823014,
 304944376412,4155112842840]