A144237 - OEIS

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A144237 as a simple table

n	a(n)
1	1
2	2
3	1
4	5
5	12
6	94
7	382
8	8683
9	15288
10	1371209
11	4724300
12	743433847
13	5878981024
14	2003707805150
15	14591668576691
16	15256793835289447
17	136761880167895688
18	342467857870682559089
19	5411121863693582877434

[1,2,1,5,12,94,382,8683,15288,1371209,4724300, 743433847,5878981024,2003707805150,14591668576691, 15256793835289447,136761880167895688, 342467857870682559089,5411121863693582877434]