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A149838 as a simple table

na(n)
01
12
24
312
436
5100
6340
71154
83650
913244
1047744
11161458
12608218
132273268
148015248
1530948100
16118491620
17429836776
181688856912
196578861670
2024365169758
2196986976404
22382761606472
231440159264108
245790859055340
2523087851622216
2687959372528576
27356553406654718
281433265655786694
295515870506340284

[1,2,4,12,36,100,340,1154,3650,13244,47744,161458,
 608218,2273268,8015248,30948100,118491620,
 429836776,1688856912,6578861670,24365169758,
 96986976404,382761606472,1440159264108,
 5790859055340,23087851622216,87959372528576,
 356553406654718,1433265655786694,5515870506340284]