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A104550 as a simple table

na(n)
11
24
320
4104
5552
62972
716172
888720
9489872
102719028
1115157188
1284799992
13475894200
142677788492
1515102309468
1685347160608
17483183316512
182739851422820
1915558315261812
2088462135512712
21503569008273992
222869602773253884
2316368396446913420
2493449566652932784
25533954950648248752

[1,4,20,104,552,2972,16172,88720,489872,2719028,
 15157188,84799992,475894200,2677788492,
 15102309468,85347160608,483183316512,
 2739851422820,15558315261812,88462135512712,
 503569008273992,2869602773253884,
 16368396446913420,93449566652932784,
 533954950648248752]