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A266902 as a simple table

na(n)
11
20
31
413
5331
617651
71386377
8148410280
920588092054
103584553946578
11764734875953730
12196150243865801221

[1,0,1,13,331,17651,1386377,148410280,20588092054,
 3584553946578,764734875953730,196150243865801221]