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A000340 as a simple table

na(n)
01
15
218
358
4179
5543
61636
74916
814757
944281
10132854
11398574
121195735
133587219
1410761672
1532285032
1696855113
17290565357
18871696090
192615088290
207845264891
2123535794695
2270607384108
23211822152348
24635466457069

[1,5,18,58,179,543,1636,4916,14757,44281,132854,
 398574,1195735,3587219,10761672,32285032,96855113,
 290565357,871696090,2615088290,7845264891,
 23535794695,70607384108,211822152348,635466457069]