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A145867 as a simple table

na(n)
01
12
26
320
474
5292
61214
75252
823468
9107672
10505048
112413776
1211723188
1357737032
14287853518
151450697572
167381645844
1737884748712
18195947389208
191020610698832
205349968198328
2128208066576176
22149526042974008
23796520870628752
244262367319460848

[1,2,6,20,74,292,1214,5252,23468,107672,505048,
 2413776,11723188,57737032,287853518,1450697572,
 7381645844,37884748712,195947389208,1020610698832,
 5349968198328,28208066576176,149526042974008,
 796520870628752,4262367319460848]