A180749 - OEIS

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A180749 as a simple table

n	a(n)
0	1
1	2
2	5
3	26
4	231
5	2844
6	43854
7	803578
8	16960731
9	404010692
10	10705681566
11	312189558548
12	9933838621998
13	342530711507568
14	12724338381577576
15	506700249728722586
16	21535304484380633171
17	973107015782753948460

[1,2,5,26,231,2844,43854,803578,16960731, 404010692,10705681566,312189558548,9933838621998, 342530711507568,12724338381577576, 506700249728722586,21535304484380633171, 973107015782753948460]