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A196721 as a simple table

na(n)
01
12
24
38
414
528
642
784
8132
9236
10352
11704
12920
131840
142736
153816
165700
1711400
1815384
1930768
2039552
2154656
2281672
23163344
24196176
25362656
26542304
27930352
281195168
292390336
302914304
315828608
328513920
3311674848
3417490432
3523484224
3628058816
3756117632
3884100800

[1,2,4,8,14,28,42,84,132,236,352,704,920,1840,
 2736,3816,5700,11400,15384,30768,39552,54656,
 81672,163344,196176,362656,542304,930352,1195168,
 2390336,2914304,5828608,8513920,11674848,17490432,
 23484224,28058816,56117632,84100800]