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A180677 as a simple table

na(n)
01
13
215
387
4503
52871
616311
792599
8525751
92985399
1016952759
1196267703
12546663863
133104271799
1417627835831
15100100959671
16568430652855
173227875241399
1818329726840247
19104086701305271
20591063984860599

[1,3,15,87,503,2871,16311,92599,525751,2985399,
 16952759,96267703,546663863,3104271799,
 17627835831,100100959671,568430652855,
 3227875241399,18329726840247,104086701305271,
 591063984860599]