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A263318 as a simple table

na(n)
00
11
25
318
455
5143
6333
7715
81430
92700
104862
118398
1213995
1322610
1435530
1554477
1681719
17120175
18173583
19246675
20345345
21476901
22650325
23876525
241168695
251542684
262017356
272615085
283362260
294289780
305433714
316835972
328544965
3310616463
3413114465
3516112057

[0,1,5,18,55,143,333,715,1430,2700,4862,8398,
 13995,22610,35530,54477,81719,120175,173583,
 246675,345345,476901,650325,876525,1168695,
 1542684,2017356,2615085,3362260,4289780,5433714,
 6835972,8544965,10616463,13114465,16112057]