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A078006 as a simple table

na(n)
01
10
22
34
48
520
644
7100
8228
9516
101172
112660
126036
1313700
1431092
1570564
16160148
17363460
18824884
191872100
204248788
219642756
2221884532
2349667620
24112722196
25255826500
26580606132
271317703524
282990568788
296787188100
3015403732724
3134959246500
3279341088148
33180067046596

[1,0,2,4,8,20,44,100,228,516,1172,2660,6036,13700,
 31092,70564,160148,363460,824884,1872100,4248788,
 9642756,21884532,49667620,112722196,255826500,
 580606132,1317703524,2990568788,6787188100,
 15403732724,34959246500,79341088148,180067046596]