A219448 - OEIS

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A219448 as a simple table

n	a(n)
1	12
2	12
3	122
4	665
5	3808
6	21219
7	121107
8	694655
9	3974138
10	22659834
11	129205873
12	737415730
13	4210118161
14	24032449623
15	137160910665
16	782820098054
17	4468022594696
18	25502122118473
19	145557024656820
20	830780509992669

[12,12,122,665,3808,21219,121107,694655,3974138, 22659834,129205873,737415730,4210118161, 24032449623,137160910665,782820098054, 4468022594696,25502122118473,145557024656820, 830780509992669]