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A006663 as a simple table

na(n)
01
11
22
32
48
512
652
786
8400
9710
103404
116316
1230888
1359204
14293192
15576018
162877184
175764430
1828967428
1958970568
20297634344
21614037754
223109111064

[1,1,2,2,8,12,52,86,400,710,3404,6316,30888,59204,
 293192,576018,2877184,5764430,28967428,58970568,
 297634344,614037754,3109111064]