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A051960 as a simple table

na(n)
02
15
216
355
4196
5714
62640
79867
837180
9140998
10537472
112057510
127904456
1330458900
14117675360
15455657715
161767883500
176871173870
1826747767200
19104268528210
20406975466040
211590307356300
226220814327520
2324357232569150
2495452906901976
25374369872911804

[2,5,16,55,196,714,2640,9867,37180,140998,537472,
 2057510,7904456,30458900,117675360,455657715,
 1767883500,6871173870,26747767200,104268528210,
 406975466040,1590307356300,6220814327520,
 24357232569150,95452906901976,374369872911804]