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A081407 as a simple table

na(n)
01
11
21
31
45
56
67
78
845
960
1077
1196
12585
13840
141155
151536
169945
1715120
1821945
1930720
20208845
21332640
22504735
23737280
245221125
258648640
2613627845
2720643840
28151412625
29259459200
30422463195
31660602880
324996616625
338821612800

[1,1,1,1,5,6,7,8,45,60,77,96,585,840,1155,1536,
 9945,15120,21945,30720,208845,332640,504735,
 737280,5221125,8648640,13627845,20643840,
 151412625,259459200,422463195,660602880,
 4996616625,8821612800]