A316585 - cp's OEIS frontend

A316585 Number of ways to stack n triangles symmetrically (pointing upwards or downwards depending on row parity).

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	3
6	3
7	6
8	7
9	12
10	12
11	21
12	23
13	39
14	43
15	74
16	81
17	138
18	151
19	257
20	281
21	479
22	525
23	895
24	981
25	1671
26	1830
27	3116
28	3414
29	5813
30	6370
31	10847
32	11887
33	20239
34	22177
35	37758
36	41375
37	70442
38	77193
39	131425
40	144020
41	245197
42	268693
43	457451
44	501288
45	853446
46	935235
47	1592242
48	1744834
49	2970580
50	3255261

[1, 1, 1, 2, 2, 3, 3, 6, 7, 12, 12, 21, 23, 39, 43, 74, 81, 138, 151, 257, 281, 479, 525, 895, 981, 1671, 1830, 3116, 3414, 5813, 6370, 10847, 11887, 20239, 22177, 37758, 41375, 70442, 77193, 131425, 144020, 245197, 268693, 457451, 501288, 853446, 935235, 1592242, 1744834, 2970580, 3255261]

cp's OEIS Frontend

A316585 Number of ways to stack n triangles symmetrically (pointing upwards or downwards depending on row parity).

Table of values

List of values