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A089820 as a simple table

na(n)
10
22
36
412
528
656
7120
8240
9480
10960
111984
123968
138064
1416128
1532256
1664512
17130048
18260096
19522240
201044480
212088960
224177920
238372224
2416744448
2533488896
2666977792
27133955584
28267911168
29536346624
301072693248
312146435072
324292870144
338585740288

[0,2,6,12,28,56,120,240,480,960,1984,3968,8064,
 16128,32256,64512,130048,260096,522240,1044480,
 2088960,4177920,8372224,16744448,33488896,
 66977792,133955584,267911168,536346624,1072693248,
 2146435072,4292870144,8585740288]