A282011 - cp's OEIS frontend

A282011 Number T(n,k) of k-element subsets of [n] having an even sum; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	0
6	1
7	1
8	1
9	1
10	1
11	2
12	2
13	2
14	1
15	1
16	2
17	4
18	6
19	3
20	0
21	1
22	3
23	6
24	10
25	9
26	3
27	0
28	1
29	3
30	9
31	19
32	19
33	9
34	3
35	1
36	1
37	4
38	12
39	28
40	38
41	28
42	12
43	4
44	1
45	1
46	4
47	16
48	44
49	66
50	60
51	40
52	20
53	5
54	0
55	1
56	5
57	20
58	60
59	110
60	126
61	100
62	60
63	25
64	5
65	0
66	1
67	5
68	25
69	85
70	170
71	226
72	226
73	170
74	85
75	25
76	5
77	1
78	1
79	6
80	30
81	110
82	255
83	396
84	452
85	396
86	255
87	110
88	30
89	6
90	1

[1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 2, 4, 6, 3, 0, 1, 3, 6, 10, 9, 3, 0, 1, 3, 9, 19, 19, 9, 3, 1, 1, 4, 12, 28, 38, 28, 12, 4, 1, 1, 4, 16, 44, 66, 60, 40, 20, 5, 0, 1, 5, 20, 60, 110, 126, 100, 60, 25, 5, 0, 1, 5, 25, 85, 170, 226, 226, 170, 85, 25, 5, 1, 1, 6, 30, 110, 255, 396, 452, 396, 255, 110, 30, 6, 1]

cp's OEIS Frontend

A282011 Number T(n,k) of k-element subsets of [n] having an even sum; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

Table of values

List of values

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	0
6	1
7	1
8	1
9	1
10	1
11	2
12	2
13	2
14	1
15	1
16	2
17	4
18	6
19	3
20	0
21	1
22	3
23	6
24	10
25	9
26	3
27	0
28	1
29	3
30	9
31	19
32	19
33	9
34	3
35	1
36	1
37	4
38	12
39	28
40	38
41	28
42	12
43	4
44	1
45	1
46	4
47	16
48	44
49	66
50	60
51	40
52	20
53	5
54	0
55	1
56	5
57	20
58	60
59	110
60	126
61	100
62	60
63	25
64	5
65	0
66	1
67	5
68	25
69	85
70	170
71	226
72	226
73	170
74	85
75	25
76	5
77	1
78	1
79	6
80	30
81	110
82	255
83	396
84	452
85	396
86	255
87	110
88	30
89	6
90	1

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	0
6	1
7	1
8	1
9	1
10	1
11	2
12	2
13	2
14	1
15	1
16	2
17	4
18	6
19	3
20	0
21	1
22	3
23	6
24	10
25	9
26	3
27	0
28	1
29	3
30	9
31	19
32	19
33	9
34	3
35	1
36	1
37	4
38	12
39	28
40	38
41	28
42	12
43	4
44	1
45	1
46	4
47	16
48	44
49	66
50	60
51	40
52	20
53	5
54	0
55	1
56	5
57	20
58	60
59	110
60	126
61	100
62	60
63	25
64	5
65	0
66	1
67	5
68	25
69	85
70	170
71	226
72	226
73	170
74	85
75	25
76	5
77	1
78	1
79	6
80	30
81	110
82	255
83	396
84	452
85	396
86	255
87	110
88	30
89	6
90	1

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	0
6	1
7	1
8	1
9	1
10	1
11	2
12	2
13	2
14	1
15	1
16	2
17	4
18	6
19	3
20	0
21	1
22	3
23	6
24	10
25	9
26	3
27	0
28	1
29	3
30	9
31	19
32	19
33	9
34	3
35	1
36	1
37	4
38	12
39	28
40	38
41	28
42	12
43	4
44	1
45	1
46	4
47	16
48	44
49	66
50	60
51	40
52	20
53	5
54	0
55	1
56	5
57	20
58	60
59	110
60	126
61	100
62	60
63	25
64	5
65	0
66	1
67	5
68	25
69	85
70	170
71	226
72	226
73	170
74	85
75	25
76	5
77	1
78	1
79	6
80	30
81	110
82	255
83	396
84	452
85	396
86	255
87	110
88	30
89	6
90	1