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A243121 as a simple table

na(n)
41
50
65
75
821
940
10100
11210
12396
13870
141790
153510
166681
1713100
1825320
1947835
2087126
21166195
22299375
23542595
24991036
251775935
263145270
275487805
289852046
2917092310
3029561070
3150696690
3288015196
33150446590
34256066280
35428469220
36727919426
371224816005
382043828145

[1,0,5,5,21,40,100,210,396,870,1790,3510,6681,
 13100,25320,47835,87126,166195,299375,542595,
 991036,1775935,3145270,5487805,9852046,17092310,
 29561070,50696690,88015196,150446590,256066280,
 428469220,727919426,1224816005,2043828145]