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A035028 as a simple table

na(n)
04
120
2104
3552
42972
516172
688720
7489872
82719028
915157188
1084799992
11475894200
122677788492
1315102309468
1485347160608
15483183316512
162739851422820
1715558315261812
1888462135512712
19503569008273992
202869602773253884
2116368396446913420
2293449566652932784

[4,20,104,552,2972,16172,88720,489872,2719028,
 15157188,84799992,475894200,2677788492,
 15102309468,85347160608,483183316512,
 2739851422820,15558315261812,88462135512712,
 503569008273992,2869602773253884,
 16368396446913420,93449566652932784]