A133280 - cp's OEIS frontend

A133280 Triangle formed by: 1 even, 2 odd, 3 even, 4 odd, ... starting with zero.

n	a(n)
0	0
1	1
2	3
3	4
4	6
5	8
6	9
7	11
8	13
9	15
10	16
11	18
12	20
13	22
14	24
15	25
16	27
17	29
18	31
19	33
20	35
21	36
22	38
23	40
24	42
25	44
26	46
27	48
28	49
29	51
30	53
31	55
32	57
33	59
34	61
35	63
36	64
37	66
38	68
39	70
40	72
41	74
42	76
43	78
44	80
45	81
46	83
47	85
48	87
49	89
50	91
51	93
52	95
53	97
54	99
55	100
56	102
57	104
58	106
59	108
60	110
61	112
62	114
63	116
64	118
65	120

[0, 1, 3, 4, 6, 8, 9, 11, 13, 15, 16, 18, 20, 22, 24, 25, 27, 29, 31, 33, 35, 36, 38, 40, 42, 44, 46, 48, 49, 51, 53, 55, 57, 59, 61, 63, 64, 66, 68, 70, 72, 74, 76, 78, 80, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120]

cp's OEIS Frontend

A133280 Triangle formed by: 1 even, 2 odd, 3 even, 4 odd, ... starting with zero.

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	4
4	6
5	8
6	9
7	11
8	13
9	15
10	16
11	18
12	20
13	22
14	24
15	25
16	27
17	29
18	31
19	33
20	35
21	36
22	38
23	40
24	42
25	44
26	46
27	48
28	49
29	51
30	53
31	55
32	57
33	59
34	61
35	63
36	64
37	66
38	68
39	70
40	72
41	74
42	76
43	78
44	80
45	81
46	83
47	85
48	87
49	89
50	91
51	93
52	95
53	97
54	99
55	100
56	102
57	104
58	106
59	108
60	110
61	112
62	114
63	116
64	118
65	120

n	a(n)
0	0
1	1
2	3
3	4
4	6
5	8
6	9
7	11
8	13
9	15
10	16
11	18
12	20
13	22
14	24
15	25
16	27
17	29
18	31
19	33
20	35
21	36
22	38
23	40
24	42
25	44
26	46
27	48
28	49
29	51
30	53
31	55
32	57
33	59
34	61
35	63
36	64
37	66
38	68
39	70
40	72
41	74
42	76
43	78
44	80
45	81
46	83
47	85
48	87
49	89
50	91
51	93
52	95
53	97
54	99
55	100
56	102
57	104
58	106
59	108
60	110
61	112
62	114
63	116
64	118
65	120

n	a(n)
0	0
1	1
2	3
3	4
4	6
5	8
6	9
7	11
8	13
9	15
10	16
11	18
12	20
13	22
14	24
15	25
16	27
17	29
18	31
19	33
20	35
21	36
22	38
23	40
24	42
25	44
26	46
27	48
28	49
29	51
30	53
31	55
32	57
33	59
34	61
35	63
36	64
37	66
38	68
39	70
40	72
41	74
42	76
43	78
44	80
45	81
46	83
47	85
48	87
49	89
50	91
51	93
52	95
53	97
54	99
55	100
56	102
57	104
58	106
59	108
60	110
61	112
62	114
63	116
64	118
65	120