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A049031 as a simple table

na(n)
10
20
32
48
520
640
780
8140
9224
10336
11504
12720
13990
141320
151760
162288
172912
183640
194550
205600
216800
228160
239792
2411628
2513680
2615960
2718620
2821560
2924794
3028336
3132384
3236800
3341600
3446800
3552650
3658968
3765772
3873080
3981200
4089900

[0,0,2,8,20,40,80,140,224,336,504,720,990,1320,
 1760,2288,2912,3640,4550,5600,6800,8160,9792,
 11628,13680,15960,18620,21560,24794,28336,32384,
 36800,41600,46800,52650,58968,65772,73080,81200,
 89900]