A263831 - cp's OEIS frontend

A263831 Values of k such that the number of rooted trees with k nodes (A000081(k)) is odd.

n	a(n)
1	1
2	2
3	5
4	8
5	10
6	14
7	15
8	16
9	17
10	18
11	22
12	23
13	25
14	27
15	28
16	30
17	33
18	35
19	38
20	40
21	42
22	49
23	50
24	56
25	61
26	64
27	65
28	67
29	68
30	71
31	73
32	74
33	75
34	76
35	77
36	78
37	82
38	84
39	87
40	93
41	98
42	99
43	104
44	108
45	113
46	114
47	115
48	117
49	118
50	119
51	120
52	121
53	122
54	123
55	124
56	127
57	128
58	135
59	137
60	138
61	139

[1, 2, 5, 8, 10, 14, 15, 16, 17, 18, 22, 23, 25, 27, 28, 30, 33, 35, 38, 40, 42, 49, 50, 56, 61, 64, 65, 67, 68, 71, 73, 74, 75, 76, 77, 78, 82, 84, 87, 93, 98, 99, 104, 108, 113, 114, 115, 117, 118, 119, 120, 121, 122, 123, 124, 127, 128, 135, 137, 138, 139]

cp's OEIS Frontend

A263831 Values of k such that the number of rooted trees with k nodes (A000081(k)) is odd.

Table of values

List of values

n	a(n)
1	1
2	2
3	5
4	8
5	10
6	14
7	15
8	16
9	17
10	18
11	22
12	23
13	25
14	27
15	28
16	30
17	33
18	35
19	38
20	40
21	42
22	49
23	50
24	56
25	61
26	64
27	65
28	67
29	68
30	71
31	73
32	74
33	75
34	76
35	77
36	78
37	82
38	84
39	87
40	93
41	98
42	99
43	104
44	108
45	113
46	114
47	115
48	117
49	118
50	119
51	120
52	121
53	122
54	123
55	124
56	127
57	128
58	135
59	137
60	138
61	139

n	a(n)
1	1
2	2
3	5
4	8
5	10
6	14
7	15
8	16
9	17
10	18
11	22
12	23
13	25
14	27
15	28
16	30
17	33
18	35
19	38
20	40
21	42
22	49
23	50
24	56
25	61
26	64
27	65
28	67
29	68
30	71
31	73
32	74
33	75
34	76
35	77
36	78
37	82
38	84
39	87
40	93
41	98
42	99
43	104
44	108
45	113
46	114
47	115
48	117
49	118
50	119
51	120
52	121
53	122
54	123
55	124
56	127
57	128
58	135
59	137
60	138
61	139

n	a(n)
1	1
2	2
3	5
4	8
5	10
6	14
7	15
8	16
9	17
10	18
11	22
12	23
13	25
14	27
15	28
16	30
17	33
18	35
19	38
20	40
21	42
22	49
23	50
24	56
25	61
26	64
27	65
28	67
29	68
30	71
31	73
32	74
33	75
34	76
35	77
36	78
37	82
38	84
39	87
40	93
41	98
42	99
43	104
44	108
45	113
46	114
47	115
48	117
49	118
50	119
51	120
52	121
53	122
54	123
55	124
56	127
57	128
58	135
59	137
60	138
61	139