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A098307 as a simple table

na(n)
00
11
27
364
4567
55041
644800
7398161
83538647
931449664
10279508327
112484125281
1222077619200
13196214447521
141743852408487
1515498457228864
16137742262651287
171224181906632721
1810879894897043200
1996694872166756081

[0,1,7,64,567,5041,44800,398161,3538647,31449664,
 279508327,2484125281,22077619200,196214447521,
 1743852408487,15498457228864,137742262651287,
 1224181906632721,10879894897043200,
 96694872166756081]