A049798 - cp's OEIS frontend

A049798 a(n) = (1/2)*Sum_{k = 1..n} T(n,k), array T as in A049800.

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	2
8	2
9	3
10	7
11	2
12	7
13	10
14	8
15	8
16	15
17	11
18	19
19	16
20	15
21	22
22	32
23	19
24	25
25	34
26	34
27	33
28	46
29	33
30	47
31	47
32	48
33	61
34	65
35	45
36	62
37	77
38	79
39	68
40	87
41	74
42	94
43	97
44	86
45	105
46	127
47	98
48	114
49	120
50	124
51	129
52	154
53	141
54	151
55	142
56	147
57	172
58	200
59	151
60	180

[0, 0, 0, 1, 0, 2, 2, 2, 3, 7, 2, 7, 10, 8, 8, 15, 11, 19, 16, 15, 22, 32, 19, 25, 34, 34, 33, 46, 33, 47, 47, 48, 61, 65, 45, 62, 77, 79, 68, 87, 74, 94, 97, 86, 105, 127, 98, 114, 120, 124, 129, 154, 141, 151, 142, 147, 172, 200, 151, 180]

cp's OEIS Frontend

A049798 a(n) = (1/2)*Sum_{k = 1..n} T(n,k), array T as in A049800.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	2
8	2
9	3
10	7
11	2
12	7
13	10
14	8
15	8
16	15
17	11
18	19
19	16
20	15
21	22
22	32
23	19
24	25
25	34
26	34
27	33
28	46
29	33
30	47
31	47
32	48
33	61
34	65
35	45
36	62
37	77
38	79
39	68
40	87
41	74
42	94
43	97
44	86
45	105
46	127
47	98
48	114
49	120
50	124
51	129
52	154
53	141
54	151
55	142
56	147
57	172
58	200
59	151
60	180

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	2
8	2
9	3
10	7
11	2
12	7
13	10
14	8
15	8
16	15
17	11
18	19
19	16
20	15
21	22
22	32
23	19
24	25
25	34
26	34
27	33
28	46
29	33
30	47
31	47
32	48
33	61
34	65
35	45
36	62
37	77
38	79
39	68
40	87
41	74
42	94
43	97
44	86
45	105
46	127
47	98
48	114
49	120
50	124
51	129
52	154
53	141
54	151
55	142
56	147
57	172
58	200
59	151
60	180

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	2
8	2
9	3
10	7
11	2
12	7
13	10
14	8
15	8
16	15
17	11
18	19
19	16
20	15
21	22
22	32
23	19
24	25
25	34
26	34
27	33
28	46
29	33
30	47
31	47
32	48
33	61
34	65
35	45
36	62
37	77
38	79
39	68
40	87
41	74
42	94
43	97
44	86
45	105
46	127
47	98
48	114
49	120
50	124
51	129
52	154
53	141
54	151
55	142
56	147
57	172
58	200
59	151
60	180