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A220876 as a simple table

na(n)
11
24
328
4232
51984
616804
7139012
81119172
98776036
1067190308
11503591332
123703703716
1326779859332
14190652265220
151337960522980
169264356481220

[1,4,28,232,1984,16804,139012,1119172,8776036,
 67190308,503591332,3703703716,26779859332,
 190652265220,1337960522980,9264356481220]