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A080631 as a simple table

na(n)
01
11
25
325
4215
51860
616481
7144334
81242992
910324847
1076993295
11371975385
12382690120
138235392
1454
151

[1,1,5,25,215,1860,16481,144334,1242992,10324847,
 76993295,371975385,382690120,8235392,54,1]