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A006444 as a simple table

na(n)
10
21
32
43
56
614
730
877
9196
10525
111414
123960
1311056
1431636
1590818
16264657
17774146
182289787
196798562
2020354005
2161164374
22184985060
23561433922
241712696708
255241637812

[0,1,2,3,6,14,30,77,196,525,1414,3960,11056,31636,
 90818,264657,774146,2289787,6798562,20354005,
 61164374,184985060,561433922,1712696708,
 5241637812]