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A007043 as a simple table

na(n)
01
10
21
31
45
516
665
7260
81085
94600
1019845
1186725
12383251
131709566
147687615
1534812519
16158614405
17726612216
183344696501
1915462729645
2071763732545
21334236300200
221561686608685
237318223046860
2434386154568375
25161970182441556
26764676831501575
273617755131480841

[1,0,1,1,5,16,65,260,1085,4600,19845,86725,383251,
 1709566,7687615,34812519,158614405,726612216,
 3344696501,15462729645,71763732545,334236300200,
 1561686608685,7318223046860,34386154568375,
 161970182441556,764676831501575,3617755131480841]