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A081187 as a simple table

na(n)
01
15
226
3140
4776
54400
625376
7148160
8872576
95169920
1030757376
11183495680
121096779776
136563901440
1439316299776
15235629363200
161412702437376
178471919656960
1850814338072576
19304817308958720
201828628975845376

[1,5,26,140,776,4400,25376,148160,872576,5169920,
 30757376,183495680,1096779776,6563901440,
 39316299776,235629363200,1412702437376,
 8471919656960,50814338072576,304817308958720,
 1828628975845376]