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A056407 as a simple table

na(n)
10
20
31
44
58
649
754
8280
9524
102362
112872
1222694
1321866
14131696
15298783
16904634
171341518
1810744516
1910748218
2072886710
21145274501
22522816718
23713023210
245892611212
257059926597
2635300963684
2770604007679

[0,0,1,4,8,49,54,280,524,2362,2872,22694,21866,
 131696,298783,904634,1341518,10744516,10748218,
 72886710,145274501,522816718,713023210,5892611212,
 7059926597,35300963684,70604007679]