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A018224 as a simple table

na(n)
01
11
24
39
436
5100
6400
71225
84900
915876
1063504
11213444
12853776
132944656
1411778624
1541409225
16165636900
17590976100
182363904400
198533694884
2034134779536
21124408576656
22497634306624
231828114918084

[1,1,4,9,36,100,400,1225,4900,15876,63504,213444,
 853776,2944656,11778624,41409225,165636900,
 590976100,2363904400,8533694884,34134779536,
 124408576656,497634306624,1828114918084]