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A271096 as a simple table

na(n)
01
15
220
388
4332
51276
65204
719492
874536
9288525
101140005
114512593
1218022937
1371970505
14287448752
151149604849

[1,5,20,88,332,1276,5204,19492,74536,288525,
 1140005,4512593,18022937,71970505,287448752,
 1149604849]