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A224071 as a simple table

na(n)
01
12
25
315
452
5201
6841
73726
817213
982047
10400600
111993377
1210071777
1351532938
14266462229
151390174911
167308741084
1738682855225
18205940368441
191102091393574
205925177392573
2131987877317887
22173337754977904

[1,2,5,15,52,201,841,3726,17213,82047,400600,
 1993377,10071777,51532938,266462229,1390174911,
 7308741084,38682855225,205940368441,1102091393574,
 5925177392573,31987877317887,173337754977904]