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A155316 as a simple table

na(n)
31
44
510
619
734
864
9439
103090
1119210
12101422
13504509
144329846
1555414347
16830264641
1712430929701
18182359363367
193254398810400
2078220337119222

[1,4,10,19,34,64,439,3090,19210,101422,504509,
 4329846,55414347,830264641,12430929701,
 182359363367,3254398810400,78220337119222]