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A081342 as a simple table

na(n)
01
15
234
3260
42056
516400
6131104
71048640
88388736
967109120
10536871424
114294968320
1234359740416
13274877911040
142199023263744
1517592186060800
16140737488388096
171125899906908160
189007199254872064
1972057594038190080
20576460752303947776
214611686018428436480

[1,5,34,260,2056,16400,131104,1048640,8388736,
 67109120,536871424,4294968320,34359740416,
 274877911040,2199023263744,17592186060800,
 140737488388096,1125899906908160,9007199254872064,
 72057594038190080,576460752303947776,
 4611686018428436480]