A050534 - cp's OEIS frontend

A050534 Tritriangular numbers: a(n) = binomial(binomial(n,2),2) = n(n+1)(n-1)*(n-2)/8.

n	a(n)
0	0
1	0
2	0
3	3
4	15
5	45
6	105
7	210
8	378
9	630
10	990
11	1485
12	2145
13	3003
14	4095
15	5460
16	7140
17	9180
18	11628
19	14535
20	17955
21	21945
22	26565
23	31878
24	37950
25	44850
26	52650
27	61425
28	71253
29	82215
30	94395
31	107880
32	122760
33	139128
34	157080
35	176715
36	198135
37	221445
38	246753
39	274170
40	303810
41	335790

[0, 0, 0, 3, 15, 45, 105, 210, 378, 630, 990, 1485, 2145, 3003, 4095, 5460, 7140, 9180, 11628, 14535, 17955, 21945, 26565, 31878, 37950, 44850, 52650, 61425, 71253, 82215, 94395, 107880, 122760, 139128, 157080, 176715, 198135, 221445, 246753, 274170, 303810, 335790]

cp's OEIS Frontend

A050534 Tritriangular numbers: a(n) = binomial(binomial(n,2),2) = n(n+1)(n-1)*(n-2)/8.

Table of values

List of values

cp's OEIS Frontend

A050534 Tritriangular numbers: a(n) = binomial(binomial(n,2),2) = n*(n+1)*(n-1)*(n-2)/8.

Table of values

List of values

A050534 Tritriangular numbers: a(n) = binomial(binomial(n,2),2) = n(n+1)(n-1)*(n-2)/8.