A331574 - cp's OEIS frontend

A331574 a(n) is the number of subsets of {1..n} that contain 3 even and 3 odd numbers.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	1
7	4
8	16
9	40
10	100
11	200
12	400
13	700
14	1225
15	1960
16	3136
17	4704
18	7056
19	10080
20	14400
21	19800
22	27225
23	36300
24	48400
25	62920
26	81796
27	104104
28	132496
29	165620
30	207025
31	254800
32	313600
33	380800
34	462400
35	554880
36	665856
37	790704
38	938961
39	1104660
40	1299600
41	1516200
42	1768900
43	2048200
44	2371600

[0, 0, 0, 0, 0, 0, 1, 4, 16, 40, 100, 200, 400, 700, 1225, 1960, 3136, 4704, 7056, 10080, 14400, 19800, 27225, 36300, 48400, 62920, 81796, 104104, 132496, 165620, 207025, 254800, 313600, 380800, 462400, 554880, 665856, 790704, 938961, 1104660, 1299600, 1516200, 1768900, 2048200, 2371600]

cp's OEIS Frontend

A331574 a(n) is the number of subsets of {1..n} that contain 3 even and 3 odd numbers.

Table of values

List of values