A045947 - cp's OEIS frontend

A045947 Triangles in open triangular matchstick arrangement (triangle minus one side) of side n.

n	a(n)
0	0
1	0
2	2
3	7
4	17
5	33
6	57
7	90
8	134
9	190
10	260
11	345
12	447
13	567
14	707
15	868
16	1052
17	1260
18	1494
19	1755
20	2045
21	2365
22	2717
23	3102
24	3522
25	3978
26	4472
27	5005
28	5579
29	6195
30	6855
31	7560
32	8312
33	9112
34	9962
35	10863
36	11817
37	12825
38	13889
39	15010
40	16190
41	17430
42	18732
43	20097
44	21527

[0, 0, 2, 7, 17, 33, 57, 90, 134, 190, 260, 345, 447, 567, 707, 868, 1052, 1260, 1494, 1755, 2045, 2365, 2717, 3102, 3522, 3978, 4472, 5005, 5579, 6195, 6855, 7560, 8312, 9112, 9962, 10863, 11817, 12825, 13889, 15010, 16190, 17430, 18732, 20097, 21527]

cp's OEIS Frontend

A045947 Triangles in open triangular matchstick arrangement (triangle minus one side) of side n.

Table of values

List of values