A153741 - OEIS

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A153741 as a simple table

n	a(n)
1	2
2	3
3	14
4	49
5	376
6	1987
7	21328
8	150337
9	2074624
10	18279971
11	308317184
12	3259985969
13	64981320704
14	801591982115
15	18436312819712
16	259914703640065
17	6774998673915904
18	107452993132016323
19	3130412454801965056

[2,3,14,49,376,1987,21328,150337,2074624,18279971, 308317184,3259985969,64981320704,801591982115, 18436312819712,259914703640065,6774998673915904, 107452993132016323,3130412454801965056]