A156040 - cp's OEIS frontend

A156040 Number of compositions (ordered partitions) of n into 3 parts (some of which may be zero), where the first is at least as great as each of the others.

n	a(n)
0	1
1	1
2	3
3	4
4	6
5	8
6	11
7	13
8	17
9	20
10	24
11	28
12	33
13	37
14	43
15	48
16	54
17	60
18	67
19	73
20	81
21	88
22	96
23	104
24	113
25	121
26	131
27	140
28	150
29	160
30	171
31	181
32	193
33	204
34	216
35	228
36	241
37	253
38	267
39	280
40	294
41	308
42	323
43	337
44	353
45	368
46	384
47	400
48	417
49	433
50	451
51	468
52	486
53	504
54	523
55	541
56	561
57	580
58	600

[1, 1, 3, 4, 6, 8, 11, 13, 17, 20, 24, 28, 33, 37, 43, 48, 54, 60, 67, 73, 81, 88, 96, 104, 113, 121, 131, 140, 150, 160, 171, 181, 193, 204, 216, 228, 241, 253, 267, 280, 294, 308, 323, 337, 353, 368, 384, 400, 417, 433, 451, 468, 486, 504, 523, 541, 561, 580, 600]

cp's OEIS Frontend

A156040 Number of compositions (ordered partitions) of n into 3 parts (some of which may be zero), where the first is at least as great as each of the others.

Table of values

List of values

n	a(n)
0	1
1	1
2	3
3	4
4	6
5	8
6	11
7	13
8	17
9	20
10	24
11	28
12	33
13	37
14	43
15	48
16	54
17	60
18	67
19	73
20	81
21	88
22	96
23	104
24	113
25	121
26	131
27	140
28	150
29	160
30	171
31	181
32	193
33	204
34	216
35	228
36	241
37	253
38	267
39	280
40	294
41	308
42	323
43	337
44	353
45	368
46	384
47	400
48	417
49	433
50	451
51	468
52	486
53	504
54	523
55	541
56	561
57	580
58	600

n	a(n)
0	1
1	1
2	3
3	4
4	6
5	8
6	11
7	13
8	17
9	20
10	24
11	28
12	33
13	37
14	43
15	48
16	54
17	60
18	67
19	73
20	81
21	88
22	96
23	104
24	113
25	121
26	131
27	140
28	150
29	160
30	171
31	181
32	193
33	204
34	216
35	228
36	241
37	253
38	267
39	280
40	294
41	308
42	323
43	337
44	353
45	368
46	384
47	400
48	417
49	433
50	451
51	468
52	486
53	504
54	523
55	541
56	561
57	580
58	600

n	a(n)
0	1
1	1
2	3
3	4
4	6
5	8
6	11
7	13
8	17
9	20
10	24
11	28
12	33
13	37
14	43
15	48
16	54
17	60
18	67
19	73
20	81
21	88
22	96
23	104
24	113
25	121
26	131
27	140
28	150
29	160
30	171
31	181
32	193
33	204
34	216
35	228
36	241
37	253
38	267
39	280
40	294
41	308
42	323
43	337
44	353
45	368
46	384
47	400
48	417
49	433
50	451
51	468
52	486
53	504
54	523
55	541
56	561
57	580
58	600