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A271066 as a simple table

na(n)
01
15
220
365
4197
5784
63080
711980
846484
9184096
10728552
112897748
1211580156
1346293916
14185100768
15740296708

[1,5,20,65,197,784,3080,11980,46484,184096,728552,
 2897748,11580156,46293916,185100768,740296708]