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A018918 as a simple table

na(n)
03
16
211
320
436
564
6113
7199
8350
9615
101080
111896
123328
135841
1410251
1517990
1631571
1755404
1897228
19170624
20299425
21525455
22922110
231618191
242839728
254983376
268745216
2715346785
2826931731
2947261894
3082938843
31145547524
32255418100
33448227520
34786584465

[3,6,11,20,36,64,113,199,350,615,1080,1896,3328,
 5841,10251,17990,31571,55404,97228,170624,299425,
 525455,922110,1618191,2839728,4983376,8745216,
 15346785,26931731,47261894,82938843,145547524,
 255418100,448227520,786584465]