A106737 - cp's OEIS frontend

A106737 a(n) = Sum_{k=0..n} ({binomial(n+k,n-k)*binomial(n,k)} mod 2).

n	a(n)
0	1
1	2
2	2
3	3
4	2
5	4
6	3
7	4
8	2
9	4
10	4
11	6
12	3
13	6
14	4
15	5
16	2
17	4
18	4
19	6
20	4
21	8
22	6
23	8
24	3
25	6
26	6
27	9
28	4
29	8
30	5
31	6
32	2
33	4
34	4
35	6
36	4
37	8
38	6
39	8
40	4
41	8
42	8
43	12
44	6
45	12
46	8
47	10
48	3
49	6
50	6
51	9
52	6
53	12
54	9
55	12
56	4
57	8
58	8
59	12
60	5
61	10
62	6
63	7
64	2
65	4
66	4
67	6
68	4
69	8
70	6
71	8
72	4
73	8
74	8
75	12
76	6
77	12
78	8
79	10
80	4
81	8
82	8
83	12
84	8
85	16
86	12
87	16
88	6
89	12
90	12
91	18
92	8
93	16
94	10
95	12

[1, 2, 2, 3, 2, 4, 3, 4, 2, 4, 4, 6, 3, 6, 4, 5, 2, 4, 4, 6, 4, 8, 6, 8, 3, 6, 6, 9, 4, 8, 5, 6, 2, 4, 4, 6, 4, 8, 6, 8, 4, 8, 8, 12, 6, 12, 8, 10, 3, 6, 6, 9, 6, 12, 9, 12, 4, 8, 8, 12, 5, 10, 6, 7, 2, 4, 4, 6, 4, 8, 6, 8, 4, 8, 8, 12, 6, 12, 8, 10, 4, 8, 8, 12, 8, 16, 12, 16, 6, 12, 12, 18, 8, 16, 10, 12]

cp's OEIS Frontend

A106737 a(n) = Sum_{k=0..n} ({binomial(n+k,n-k)*binomial(n,k)} mod 2).

Table of values

List of values

n	a(n)
0	1
1	2
2	2
3	3
4	2
5	4
6	3
7	4
8	2
9	4
10	4
11	6
12	3
13	6
14	4
15	5
16	2
17	4
18	4
19	6
20	4
21	8
22	6
23	8
24	3
25	6
26	6
27	9
28	4
29	8
30	5
31	6
32	2
33	4
34	4
35	6
36	4
37	8
38	6
39	8
40	4
41	8
42	8
43	12
44	6
45	12
46	8
47	10
48	3
49	6
50	6
51	9
52	6
53	12
54	9
55	12
56	4
57	8
58	8
59	12
60	5
61	10
62	6
63	7
64	2
65	4
66	4
67	6
68	4
69	8
70	6
71	8
72	4
73	8
74	8
75	12
76	6
77	12
78	8
79	10
80	4
81	8
82	8
83	12
84	8
85	16
86	12
87	16
88	6
89	12
90	12
91	18
92	8
93	16
94	10
95	12

n	a(n)
0	1
1	2
2	2
3	3
4	2
5	4
6	3
7	4
8	2
9	4
10	4
11	6
12	3
13	6
14	4
15	5
16	2
17	4
18	4
19	6
20	4
21	8
22	6
23	8
24	3
25	6
26	6
27	9
28	4
29	8
30	5
31	6
32	2
33	4
34	4
35	6
36	4
37	8
38	6
39	8
40	4
41	8
42	8
43	12
44	6
45	12
46	8
47	10
48	3
49	6
50	6
51	9
52	6
53	12
54	9
55	12
56	4
57	8
58	8
59	12
60	5
61	10
62	6
63	7
64	2
65	4
66	4
67	6
68	4
69	8
70	6
71	8
72	4
73	8
74	8
75	12
76	6
77	12
78	8
79	10
80	4
81	8
82	8
83	12
84	8
85	16
86	12
87	16
88	6
89	12
90	12
91	18
92	8
93	16
94	10
95	12

n	a(n)
0	1
1	2
2	2
3	3
4	2
5	4
6	3
7	4
8	2
9	4
10	4
11	6
12	3
13	6
14	4
15	5
16	2
17	4
18	4
19	6
20	4
21	8
22	6
23	8
24	3
25	6
26	6
27	9
28	4
29	8
30	5
31	6
32	2
33	4
34	4
35	6
36	4
37	8
38	6
39	8
40	4
41	8
42	8
43	12
44	6
45	12
46	8
47	10
48	3
49	6
50	6
51	9
52	6
53	12
54	9
55	12
56	4
57	8
58	8
59	12
60	5
61	10
62	6
63	7
64	2
65	4
66	4
67	6
68	4
69	8
70	6
71	8
72	4
73	8
74	8
75	12
76	6
77	12
78	8
79	10
80	4
81	8
82	8
83	12
84	8
85	16
86	12
87	16
88	6
89	12
90	12
91	18
92	8
93	16
94	10
95	12