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A019020 as a simple table

na(n)
22
36
436
5150
6938
75968
836762
9235074
101553854
1110377280
1270137652
13479982854
143319376006
1523157283294
16162789085594

[2,6,36,150,938,5968,36762,235074,1553854,
 10377280,70137652,479982854,3319376006,
 23157283294,162789085594]