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A015532 as a simple table

na(n)
00
11
24
323
4120
5641
63404
718103
896240
9511681
102720404
1114463383
1276896360
13408829121
142173591004
1511556167863
1661439808480
17326652408961
181736688295204
199233320043543
2049090098240600
21260993633267201
221387605220753004
237377376315882423

[0,1,4,23,120,641,3404,18103,96240,511681,2720404,
 14463383,76896360,408829121,2173591004,
 11556167863,61439808480,326652408961,
 1736688295204,9233320043543,49090098240600,
 260993633267201,1387605220753004,7377376315882423]