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A064831 as a simple table

na(n)
00
11
23
39
424
564
6168
7441
81155
93025
107920
1120736
1254288
13142129
14372099
15974169
162550408
176677056
1817480760
1945765225
20119814915
21313679521
22821223648
232149991424
245628750624
2514736260449
2638580030723
27101003831721

[0,1,3,9,24,64,168,441,1155,3025,7920,20736,54288,
 142129,372099,974169,2550408,6677056,17480760,
 45765225,119814915,313679521,821223648,2149991424,
 5628750624,14736260449,38580030723,101003831721]