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A056541 as a simple table

na(n)
00
11
25
331
4249
52491
629893
7418503
86696049
9120528883
102410577661
1153032708543
121272785005033
1333092410130859
14926587483664053
1527797624509921591
16889523984317490913
1730243815466794691043

[0,1,5,31,249,2491,29893,418503,6696049,120528883,
 2410577661,53032708543,1272785005033,
 33092410130859,926587483664053,27797624509921591,
 889523984317490913,30243815466794691043]