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A007526 as a simple table

na(n)
00
11
24
315
464
5325
61956
713699
8109600
9986409
109864100
11108505111
121302061344
1316926797485
14236975164804
153554627472075
1656874039553216
17966858672404689
1817403456103284420
19330665665962403999
206613313319248080000
21138879579704209680021
223055350753492612960484

[0,1,4,15,64,325,1956,13699,109600,986409,9864100,
 108505111,1302061344,16926797485,236975164804,
 3554627472075,56874039553216,966858672404689,
 17403456103284420,330665665962403999,
 6613313319248080000,138879579704209680021,
 3055350753492612960484]