A300749 - OEIS

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A300749 as a simple table

n	a(n)
1	1
2	1
3	1
4	2
5	3
6	7
7	12
8	30
9	64
10	177
11	457
12	1403
13	4327
14	15024
15	54730
16	219311
17	942908
18	4426513
19	22525015
20	124896794
21	752933593
22	4938212176
23	35190683416
24	272266028155
25	2284292635109

[1,1,1,2,3,7,12,30,64,177,457,1403,4327,15024, 54730,219311,942908,4426513,22525015,124896794, 752933593,4938212176,35190683416,272266028155, 2284292635109]