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A081189 as a simple table

na(n)
01
17
250
3364
42696
520272
6154400
71188544
89228416
972147712
10567104000
114476365824
1235448129536
13281408253952
142238205337600
1517827278536704
16142148043309056
171134363236564992
189057979233075200
1972362273907933184

[1,7,50,364,2696,20272,154400,1188544,9228416,
 72147712,567104000,4476365824,35448129536,
 281408253952,2238205337600,17827278536704,
 142148043309056,1134363236564992,9057979233075200,
 72362273907933184]