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A151961 as a simple table

na(n)
13
26
321
478
5291
61086
74053
815126
956451
10210678
11786261
122934366
1310951203
1440870446
15152530581
16569251878
172124476931
187928655846
1929590146453
20110431929966
21412137573411
221538118363678
235740335881301
2421423225161526
2579952564764803
26298387033897686

[3,6,21,78,291,1086,4053,15126,56451,210678,
 786261,2934366,10951203,40870446,152530581,
 569251878,2124476931,7928655846,29590146453,
 110431929966,412137573411,1538118363678,
 5740335881301,21423225161526,79952564764803,
 298387033897686]