A120625 - cp's OEIS frontend

A120625 Numbers n such that the n-th Catalan number C(2n,n)/(n+1) is divisible by 3n.

n	a(n)
1	15
2	20
3	42
4	77
5	88
6	104
7	126
8	140
9	153
10	156
11	170
12	187
13	190
14	204
15	209
16	210
17	220
18	228
19	231
20	238
21	240
22	266
23	299
24	308
25	312
26	322
27	368
28	420
29	429
30	435
31	440
32	442
33	450
34	460
35	464
36	468
37	476
38	483
39	493
40	496
41	510
42	527
43	551
44	558
45	561
46	580
47	589
48	600
49	609
50	620
51	624
52	651
53	665

[15, 20, 42, 77, 88, 104, 126, 140, 153, 156, 170, 187, 190, 204, 209, 210, 220, 228, 231, 238, 240, 266, 299, 308, 312, 322, 368, 420, 429, 435, 440, 442, 450, 460, 464, 468, 476, 483, 493, 496, 510, 527, 551, 558, 561, 580, 589, 600, 609, 620, 624, 651, 665]

cp's OEIS Frontend

A120625 Numbers n such that the n-th Catalan number C(2n,n)/(n+1) is divisible by 3n.

Table of values

List of values

n	a(n)
1	15
2	20
3	42
4	77
5	88
6	104
7	126
8	140
9	153
10	156
11	170
12	187
13	190
14	204
15	209
16	210
17	220
18	228
19	231
20	238
21	240
22	266
23	299
24	308
25	312
26	322
27	368
28	420
29	429
30	435
31	440
32	442
33	450
34	460
35	464
36	468
37	476
38	483
39	493
40	496
41	510
42	527
43	551
44	558
45	561
46	580
47	589
48	600
49	609
50	620
51	624
52	651
53	665

n	a(n)
1	15
2	20
3	42
4	77
5	88
6	104
7	126
8	140
9	153
10	156
11	170
12	187
13	190
14	204
15	209
16	210
17	220
18	228
19	231
20	238
21	240
22	266
23	299
24	308
25	312
26	322
27	368
28	420
29	429
30	435
31	440
32	442
33	450
34	460
35	464
36	468
37	476
38	483
39	493
40	496
41	510
42	527
43	551
44	558
45	561
46	580
47	589
48	600
49	609
50	620
51	624
52	651
53	665

n	a(n)
1	15
2	20
3	42
4	77
5	88
6	104
7	126
8	140
9	153
10	156
11	170
12	187
13	190
14	204
15	209
16	210
17	220
18	228
19	231
20	238
21	240
22	266
23	299
24	308
25	312
26	322
27	368
28	420
29	429
30	435
31	440
32	442
33	450
34	460
35	464
36	468
37	476
38	483
39	493
40	496
41	510
42	527
43	551
44	558
45	561
46	580
47	589
48	600
49	609
50	620
51	624
52	651
53	665