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A155235 as a simple table

na(n)
31
44
513
637
7152
8704
95022
1042621
11420222
125313446
1383504848
141668949583
1541600395450
161285489016880
1749769130940759

[1,4,13,37,152,704,5022,42621,420222,5313446,
 83504848,1668949583,41600395450,1285489016880,
 49769130940759]