A337063 - cp's OEIS frontend

A337063 a(n) = 1 for n < 2; a(n) = freq(a(n-1),n) * freq(a(n-2),n) for n >= 2, where freq(i,j) is the number of times i appears in [a(0),a(1),...,a(j-1)].

n	a(n)
0	1
1	1
2	4
3	2
4	1
5	3
6	3
7	4
8	4
9	9
10	3
11	3
12	16
13	4
14	4
15	25
16	5
17	1
18	4
19	24
20	6
21	1
22	5
23	10
24	2
25	2
26	9
27	6
28	4
29	14
30	7
31	1
32	6
33	18
34	3
35	5
36	15
37	3
38	6
39	24
40	8
41	2
42	4
43	32
44	8
45	2
46	10
47	10
48	9
49	9
50	16
51	8
52	6
53	15
54	10
55	8
56	16
57	12
58	3
59	7
60	14
61	4
62	18
63	18
64	9
65	15
66	15
67	16
68	16
69	25
70	10
71	10
72	36
73	6
74	6
75	49
76	7
77	3

[1, 1, 4, 2, 1, 3, 3, 4, 4, 9, 3, 3, 16, 4, 4, 25, 5, 1, 4, 24, 6, 1, 5, 10, 2, 2, 9, 6, 4, 14, 7, 1, 6, 18, 3, 5, 15, 3, 6, 24, 8, 2, 4, 32, 8, 2, 10, 10, 9, 9, 16, 8, 6, 15, 10, 8, 16, 12, 3, 7, 14, 4, 18, 18, 9, 15, 15, 16, 16, 25, 10, 10, 36, 6, 6, 49, 7, 3]

cp's OEIS Frontend

A337063 a(n) = 1 for n < 2; a(n) = freq(a(n-1),n) * freq(a(n-2),n) for n >= 2, where freq(i,j) is the number of times i appears in [a(0),a(1),...,a(j-1)].

Table of values

List of values

n	a(n)
0	1
1	1
2	4
3	2
4	1
5	3
6	3
7	4
8	4
9	9
10	3
11	3
12	16
13	4
14	4
15	25
16	5
17	1
18	4
19	24
20	6
21	1
22	5
23	10
24	2
25	2
26	9
27	6
28	4
29	14
30	7
31	1
32	6
33	18
34	3
35	5
36	15
37	3
38	6
39	24
40	8
41	2
42	4
43	32
44	8
45	2
46	10
47	10
48	9
49	9
50	16
51	8
52	6
53	15
54	10
55	8
56	16
57	12
58	3
59	7
60	14
61	4
62	18
63	18
64	9
65	15
66	15
67	16
68	16
69	25
70	10
71	10
72	36
73	6
74	6
75	49
76	7
77	3

n	a(n)
0	1
1	1
2	4
3	2
4	1
5	3
6	3
7	4
8	4
9	9
10	3
11	3
12	16
13	4
14	4
15	25
16	5
17	1
18	4
19	24
20	6
21	1
22	5
23	10
24	2
25	2
26	9
27	6
28	4
29	14
30	7
31	1
32	6
33	18
34	3
35	5
36	15
37	3
38	6
39	24
40	8
41	2
42	4
43	32
44	8
45	2
46	10
47	10
48	9
49	9
50	16
51	8
52	6
53	15
54	10
55	8
56	16
57	12
58	3
59	7
60	14
61	4
62	18
63	18
64	9
65	15
66	15
67	16
68	16
69	25
70	10
71	10
72	36
73	6
74	6
75	49
76	7
77	3

n	a(n)
0	1
1	1
2	4
3	2
4	1
5	3
6	3
7	4
8	4
9	9
10	3
11	3
12	16
13	4
14	4
15	25
16	5
17	1
18	4
19	24
20	6
21	1
22	5
23	10
24	2
25	2
26	9
27	6
28	4
29	14
30	7
31	1
32	6
33	18
34	3
35	5
36	15
37	3
38	6
39	24
40	8
41	2
42	4
43	32
44	8
45	2
46	10
47	10
48	9
49	9
50	16
51	8
52	6
53	15
54	10
55	8
56	16
57	12
58	3
59	7
60	14
61	4
62	18
63	18
64	9
65	15
66	15
67	16
68	16
69	25
70	10
71	10
72	36
73	6
74	6
75	49
76	7
77	3