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A270023 as a simple table

na(n)
01
15
220
376
4276
5932
63944
715956
865692
9259452
101035464
114159724
1216638488
1366605372
14266499652
151065764840

[1,5,20,76,276,932,3944,15956,65692,259452,
 1035464,4159724,16638488,66605372,266499652,
 1065764840]