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A006471 as a simple table

na(n)
15
284
3650
43324
513020
642240
7118998
8300300
9693693
101490060
113011580
125779592
1310608000
1418728832
1531957620
1652907400
1785261341
18134115300
19206402966
20311417700
21461446700
22672534720
23965396250
241366496820
251909325925
262635885980
273598423704
284861432400
296503955744
308622225920

[5,84,650,3324,13020,42240,118998,300300,693693,
 1490060,3011580,5779592,10608000,18728832,
 31957620,52907400,85261341,134115300,206402966,
 311417700,461446700,672534720,965396250,
 1366496820,1909325925,2635885980,3598423704,
 4861432400,6503955744,8622225920]