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A198834 as a simple table

na(n)
10
20
32
42
54
66
710
816
926
1042
1168
12110
13178
14288
15466
16754
171220
181974
193194
205168
218362
2213530
2321892
2435422
2557314
2692736
27150050
28242786
29392836
30635622
311028458
321664080
332692538
344356618
357049156
3611405774
3718454930
3829860704
3948315634
4078176338

[0,0,2,2,4,6,10,16,26,42,68,110,178,288,466,754,
 1220,1974,3194,5168,8362,13530,21892,35422,57314,
 92736,150050,242786,392836,635622,1028458,1664080,
 2692538,4356618,7049156,11405774,18454930,
 29860704,48315634,78176338]