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A263591 as a simple table

na(n)
11
22
36
416
552
6208
7800
83360
916224
1078088
11393408
122189872
1312371616
1471835000
15448860480
162871278464
1718727425440
18129070035784
19913845701344

[1,2,6,16,52,208,800,3360,16224,78088,393408,
 2189872,12371616,71835000,448860480,2871278464,
 18727425440,129070035784,913845701344]