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A006138 as a simple table

na(n)
01
12
25
311
426
559
6137
7314
8725
91667
103842
118843
1220369
1346898
14108005
15248699
16572714
171318811
183036953
196993386
2016104245
2137084403
2285397138
23196650347
24452841761
251042792802
262401318085
275529696491
2812733650746
2929322740219
3067523692457
31155491913114

[1,2,5,11,26,59,137,314,725,1667,3842,8843,20369,
 46898,108005,248699,572714,1318811,3036953,
 6993386,16104245,37084403,85397138,196650347,
 452841761,1042792802,2401318085,5529696491,
 12733650746,29322740219,67523692457,155491913114]