A045975 - cp's OEIS frontend

A045975 Take the first odd integer and multiple of 1, the next 2 even integers and multiples of 2, the next 3 odd integers and multiples of 3, the next 4 even integers and multiples of 4, ...

n	a(n)
1	1
2	2
3	4
4	9
5	15
6	21
7	24
8	28
9	32
10	36
11	45
12	55
13	65
14	75
15	85
16	90
17	96
18	102
19	108
20	114
21	120
22	133
23	147
24	161
25	175
26	189
27	203
28	217
29	224
30	232
31	240
32	248
33	256
34	264
35	272
36	280
37	297
38	315
39	333
40	351
41	369
42	387
43	405
44	423
45	441
46	450
47	460
48	470
49	480
50	490
51	500
52	510
53	520
54	530
55	540
56	561
57	583
58	605
59	627
60	649
61	671
62	693

[1, 2, 4, 9, 15, 21, 24, 28, 32, 36, 45, 55, 65, 75, 85, 90, 96, 102, 108, 114, 120, 133, 147, 161, 175, 189, 203, 217, 224, 232, 240, 248, 256, 264, 272, 280, 297, 315, 333, 351, 369, 387, 405, 423, 441, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 561, 583, 605, 627, 649, 671, 693]

cp's OEIS Frontend

A045975 Take the first odd integer and multiple of 1, the next 2 even integers and multiples of 2, the next 3 odd integers and multiples of 3, the next 4 even integers and multiples of 4, ...

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	9
5	15
6	21
7	24
8	28
9	32
10	36
11	45
12	55
13	65
14	75
15	85
16	90
17	96
18	102
19	108
20	114
21	120
22	133
23	147
24	161
25	175
26	189
27	203
28	217
29	224
30	232
31	240
32	248
33	256
34	264
35	272
36	280
37	297
38	315
39	333
40	351
41	369
42	387
43	405
44	423
45	441
46	450
47	460
48	470
49	480
50	490
51	500
52	510
53	520
54	530
55	540
56	561
57	583
58	605
59	627
60	649
61	671
62	693

n	a(n)
1	1
2	2
3	4
4	9
5	15
6	21
7	24
8	28
9	32
10	36
11	45
12	55
13	65
14	75
15	85
16	90
17	96
18	102
19	108
20	114
21	120
22	133
23	147
24	161
25	175
26	189
27	203
28	217
29	224
30	232
31	240
32	248
33	256
34	264
35	272
36	280
37	297
38	315
39	333
40	351
41	369
42	387
43	405
44	423
45	441
46	450
47	460
48	470
49	480
50	490
51	500
52	510
53	520
54	530
55	540
56	561
57	583
58	605
59	627
60	649
61	671
62	693

n	a(n)
1	1
2	2
3	4
4	9
5	15
6	21
7	24
8	28
9	32
10	36
11	45
12	55
13	65
14	75
15	85
16	90
17	96
18	102
19	108
20	114
21	120
22	133
23	147
24	161
25	175
26	189
27	203
28	217
29	224
30	232
31	240
32	248
33	256
34	264
35	272
36	280
37	297
38	315
39	333
40	351
41	369
42	387
43	405
44	423
45	441
46	450
47	460
48	470
49	480
50	490
51	500
52	510
53	520
54	530
55	540
56	561
57	583
58	605
59	627
60	649
61	671
62	693