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A015559 as a simple table

na(n)
00
11
27
352
4385
52851
621112
7156337
81157695
98572876
1063483217
11470101147
123481157680
1325778407201
14190892323447
151413581485732
1610467747370465
1777514976050451
18574008074464552
194250601449403217
2031476234369216175

[0,1,7,52,385,2851,21112,156337,1157695,8572876,
 63483217,470101147,3481157680,25778407201,
 190892323447,1413581485732,10467747370465,
 77514976050451,574008074464552,4250601449403217,
 31476234369216175]