A137822 - cp's OEIS frontend

A137822 First differences of A137821 (numbers such that sum( Catalan(k), k=1..2n) = 0 (mod 3)).

n	a(n)
1	1
2	3
3	2
4	7
5	2
6	3
7	1
8	21
9	2
10	3
11	1
12	8
13	1
14	3
15	2
16	61
17	2
18	3
19	1
20	8
21	1
22	3
23	2
24	21
25	1
26	3
27	2
28	7
29	2
30	3
31	1
32	183
33	2
34	3
35	1
36	8
37	1
38	3
39	2
40	21
41	1
42	3
43	2
44	7
45	2
46	3
47	1
48	62
49	1
50	3
51	2
52	7
53	2
54	3
55	1
56	21
57	2
58	3
59	1
60	8
61	1
62	3
63	2
64	547
65	2
66	3
67	1
68	8
69	1
70	3
71	2
72	21
73	1
74	3
75	2
76	7
77	2
78	3
79	1
80	62
81	1
82	3
83	2
84	7
85	2
86	3
87	1
88	21
89	2
90	3
91	1
92	8
93	1
94	3
95	2
96	183
97	1
98	3
99	2

[1, 3, 2, 7, 2, 3, 1, 21, 2, 3, 1, 8, 1, 3, 2, 61, 2, 3, 1, 8, 1, 3, 2, 21, 1, 3, 2, 7, 2, 3, 1, 183, 2, 3, 1, 8, 1, 3, 2, 21, 1, 3, 2, 7, 2, 3, 1, 62, 1, 3, 2, 7, 2, 3, 1, 21, 2, 3, 1, 8, 1, 3, 2, 547, 2, 3, 1, 8, 1, 3, 2, 21, 1, 3, 2, 7, 2, 3, 1, 62, 1, 3, 2, 7, 2, 3, 1, 21, 2, 3, 1, 8, 1, 3, 2, 183, 1, 3, 2]

cp's OEIS Frontend

A137822 First differences of A137821 (numbers such that sum( Catalan(k), k=1..2n) = 0 (mod 3)).

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	7
5	2
6	3
7	1
8	21
9	2
10	3
11	1
12	8
13	1
14	3
15	2
16	61
17	2
18	3
19	1
20	8
21	1
22	3
23	2
24	21
25	1
26	3
27	2
28	7
29	2
30	3
31	1
32	183
33	2
34	3
35	1
36	8
37	1
38	3
39	2
40	21
41	1
42	3
43	2
44	7
45	2
46	3
47	1
48	62
49	1
50	3
51	2
52	7
53	2
54	3
55	1
56	21
57	2
58	3
59	1
60	8
61	1
62	3
63	2
64	547
65	2
66	3
67	1
68	8
69	1
70	3
71	2
72	21
73	1
74	3
75	2
76	7
77	2
78	3
79	1
80	62
81	1
82	3
83	2
84	7
85	2
86	3
87	1
88	21
89	2
90	3
91	1
92	8
93	1
94	3
95	2
96	183
97	1
98	3
99	2

n	a(n)
1	1
2	3
3	2
4	7
5	2
6	3
7	1
8	21
9	2
10	3
11	1
12	8
13	1
14	3
15	2
16	61
17	2
18	3
19	1
20	8
21	1
22	3
23	2
24	21
25	1
26	3
27	2
28	7
29	2
30	3
31	1
32	183
33	2
34	3
35	1
36	8
37	1
38	3
39	2
40	21
41	1
42	3
43	2
44	7
45	2
46	3
47	1
48	62
49	1
50	3
51	2
52	7
53	2
54	3
55	1
56	21
57	2
58	3
59	1
60	8
61	1
62	3
63	2
64	547
65	2
66	3
67	1
68	8
69	1
70	3
71	2
72	21
73	1
74	3
75	2
76	7
77	2
78	3
79	1
80	62
81	1
82	3
83	2
84	7
85	2
86	3
87	1
88	21
89	2
90	3
91	1
92	8
93	1
94	3
95	2
96	183
97	1
98	3
99	2

n	a(n)
1	1
2	3
3	2
4	7
5	2
6	3
7	1
8	21
9	2
10	3
11	1
12	8
13	1
14	3
15	2
16	61
17	2
18	3
19	1
20	8
21	1
22	3
23	2
24	21
25	1
26	3
27	2
28	7
29	2
30	3
31	1
32	183
33	2
34	3
35	1
36	8
37	1
38	3
39	2
40	21
41	1
42	3
43	2
44	7
45	2
46	3
47	1
48	62
49	1
50	3
51	2
52	7
53	2
54	3
55	1
56	21
57	2
58	3
59	1
60	8
61	1
62	3
63	2
64	547
65	2
66	3
67	1
68	8
69	1
70	3
71	2
72	21
73	1
74	3
75	2
76	7
77	2
78	3
79	1
80	62
81	1
82	3
83	2
84	7
85	2
86	3
87	1
88	21
89	2
90	3
91	1
92	8
93	1
94	3
95	2
96	183
97	1
98	3
99	2