A176452 - cp's OEIS frontend

A176452 Irregular triangle read by rows: T(n,k) = number of Huffman-equivalence classes of ternary trees with 2n+1 leaves and 3k leaves on the bottom level (n>=1, k>=1).

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	4
9	2
10	1
11	7
12	4
13	2
14	13
15	7
16	4
17	1
18	25
19	13
20	7
21	2
22	1
23	48
24	25
25	13
26	3
27	2
28	1
29	92
30	48
31	25
32	6
33	3
34	2
35	176
36	92
37	48
38	12
39	6
40	3
41	1
42	338
43	176
44	92
45	23
46	12
47	6
48	1

[1, 1, 1, 1, 2, 1, 1, 4, 2, 1, 7, 4, 2, 13, 7, 4, 1, 25, 13, 7, 2, 1, 48, 25, 13, 3, 2, 1, 92, 48, 25, 6, 3, 2, 176, 92, 48, 12, 6, 3, 1, 338, 176, 92, 23, 12, 6, 1]

cp's OEIS Frontend

A176452 Irregular triangle read by rows: T(n,k) = number of Huffman-equivalence classes of ternary trees with 2n+1 leaves and 3k leaves on the bottom level (n>=1, k>=1).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	4
9	2
10	1
11	7
12	4
13	2
14	13
15	7
16	4
17	1
18	25
19	13
20	7
21	2
22	1
23	48
24	25
25	13
26	3
27	2
28	1
29	92
30	48
31	25
32	6
33	3
34	2
35	176
36	92
37	48
38	12
39	6
40	3
41	1
42	338
43	176
44	92
45	23
46	12
47	6
48	1

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	4
9	2
10	1
11	7
12	4
13	2
14	13
15	7
16	4
17	1
18	25
19	13
20	7
21	2
22	1
23	48
24	25
25	13
26	3
27	2
28	1
29	92
30	48
31	25
32	6
33	3
34	2
35	176
36	92
37	48
38	12
39	6
40	3
41	1
42	338
43	176
44	92
45	23
46	12
47	6
48	1

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	4
9	2
10	1
11	7
12	4
13	2
14	13
15	7
16	4
17	1
18	25
19	13
20	7
21	2
22	1
23	48
24	25
25	13
26	3
27	2
28	1
29	92
30	48
31	25
32	6
33	3
34	2
35	176
36	92
37	48
38	12
39	6
40	3
41	1
42	338
43	176
44	92
45	23
46	12
47	6
48	1