A183848 - OEIS

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A183848 as a simple table

n	a(n)
1	328
2	1766
3	9557
4	54724
5	310856
6	1846987
7	10793131
8	65461226
9	388802189
10	2384144524
11	14297712925
12	88196069895
13	532232190325
14	3294387009947
15	19971273401620
16	123891049069844
17	753824181622246
18	4683860177500797

[328,1766,9557,54724,310856,1846987,10793131, 65461226,388802189,2384144524,14297712925, 88196069895,532232190325,3294387009947, 19971273401620,123891049069844,753824181622246, 4683860177500797]