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A125180 as a simple table

na(n)
12
25
312
426
556
6114
7232
8466
9936
101878
113758
127522
1315048
1430098
1560200
16120406
17240818
18481638
19963282
201926568
213853138
227706282
2315412568
2430825142
2561650292
26123300588
27246601178
28493202360
29986404722
301972809448
313945618910

[2,5,12,26,56,114,232,466,936,1878,3758,7522,
 15048,30098,60200,120406,240818,481638,963282,
 1926568,3853138,7706282,15412568,30825142,
 61650292,123300588,246601178,493202360,986404722,
 1972809448,3945618910]