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A142974 as a simple table

na(n)
11
22
32
42
54
612
734
886
9200
10440
11934
121938
133964
148036
1516202
1632558
1765296
18130800
19261838
20523946
211048196
222096732
234193842
248388102
2516776664
2633553832
2767108214
28134217026
29268434700
30536870100
311073740954
322147482718

[1,2,2,2,4,12,34,86,200,440,934,1938,3964,8036,
 16202,32558,65296,130800,261838,523946,1048196,
 2096732,4193842,8388102,16776664,33553832,
 67108214,134217026,268434700,536870100,1073740954,
 2147482718]