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A261105 as a simple table

na(n)
128
252
3278
41498
513040
6127038
72037285
835551388
91021480084
1032245216400
111673092329256
1295096605137684
138890756299113053
14911310851213791400
15153607181860224749014
1628380233483547958852746
178623267987086739769774234

[28,52,278,1498,13040,127038,2037285,35551388,
 1021480084,32245216400,1673092329256,
 95096605137684,8890756299113053,
 911310851213791400,153607181860224749014,
 28380233483547958852746,8623267987086739769774234]