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A025007 as a simple table

na(n)
01
131
2635
310835
4166851
52407971
633252835
7445002595
85818890851
974768679011
10947871169635
1111890741318755
12147930305201251
131828206048535651
1422473922782504035
15275081786101769315

[1,31,635,10835,166851,2407971,33252835,445002595,
 5818890851,74768679011,947871169635,
 11890741318755,147930305201251,1828206048535651,
 22473922782504035,275081786101769315]