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A284994 as a simple table

na(n)
11
21
30
41
51
62
73
86
911
1024
1152
12120
13287
14720
151871
165040
1714034
1840320
19119292
20362880
211133278
223628800
2311899423
2439916800
25136843365
26479001600
271710542068
286227020800
2923092317922
3087178291200
31334838609873
321307674368000
335189998453040

[1,1,0,1,1,2,3,6,11,24,52,120,287,720,1871,5040,
 14034,40320,119292,362880,1133278,3628800,
 11899423,39916800,136843365,479001600,1710542068,
 6227020800,23092317922,87178291200,334838609873,
 1307674368000,5189998453040]