A240740 - OEIS

A240740 as a simple table

n	a(n)
15	1
16	1
17	3
18	7
19	16
20	35
21	70
22	155
23	321
24	665
25	1368
26	2802
27	5711
28	11623
29	23526
30	47567
31	95967
32	193316
33	388893
34	781519
35	1569154
36	3148292
37	6313052
38	12652917
39	25349663
40	50770869
41	101658425
42	203506976
43	407323589
44	815151106
45	1631122032
46	3263576647
47	6529319168
48	13062156519

[1,1,3,7,16,35,70,155,321,665,1368,2802,5711, 11623,23526,47567,95967,193316,388893,781519, 1569154,3148292,6313052,12652917,25349663, 50770869,101658425,203506976,407323589,815151106, 1631122032,3263576647,6529319168,13062156519]