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A001407 as a simple table

na(n)
01
10
20
38
433
5168
6962
75928
838907
9268056
101918938
1114169360
12107333498
13830660688
146546655404
1552410001448

[1,0,0,8,33,168,962,5928,38907,268056,1918938,
 14169360,107333498,830660688,6546655404,
 52410001448]