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A074417 as a simple table

na(n)
11
21
32
45
525
6104
7450
81935
98666
1039050
11177784
12814006
133756250
1417437275
1581380200
16381468750
171795156250
188477078967
1940154687500
20190734843750
21908261625600
224334883611534
2320732050781250
2499341072183730
25476837158203125
262292486335637500

[1,1,2,5,25,104,450,1935,8666,39050,177784,814006,
 3756250,17437275,81380200,381468750,1795156250,
 8477078967,40154687500,190734843750,908261625600,
 4334883611534,20732050781250,99341072183730,
 476837158203125,2292486335637500]