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A015534 as a simple table

na(n)
00
11
24
327
4152
5905
65292
731123
8182704
91073169
106302420
1137014539
12217384776
131276699033
147498028668
1544035804035
16258621531488
171518879970337
188920356727716
1952389106584571
20307680350343160

[0,1,4,27,152,905,5292,31123,182704,1073169,
 6302420,37014539,217384776,1276699033,7498028668,
 44035804035,258621531488,1518879970337,
 8920356727716,52389106584571,307680350343160]