A011931 - cp's OEIS frontend

A011931 a(n) = floor(n(n-1)(n-2)*(n-3)/21).

n	a(n)
0	0
1	0
2	0
3	0
4	1
5	5
6	17
7	40
8	80
9	144
10	240
11	377
12	565
13	817
14	1144
15	1560
16	2080
17	2720
18	3497
19	4429
20	5537
21	6840
22	8360
23	10120
24	12144
25	14457
26	17085
27	20057
28	23400
29	27144
30	31320
31	35960
32	41097
33	46765
34	53001
35	59840
36	67320
37	75480
38	84360
39	94001
40	104445
41	115737
42	127920
43	141040
44	155144
45	170280
46	186497
47	203845
48	222377
49	242144

[0, 0, 0, 0, 1, 5, 17, 40, 80, 144, 240, 377, 565, 817, 1144, 1560, 2080, 2720, 3497, 4429, 5537, 6840, 8360, 10120, 12144, 14457, 17085, 20057, 23400, 27144, 31320, 35960, 41097, 46765, 53001, 59840, 67320, 75480, 84360, 94001, 104445, 115737, 127920, 141040, 155144, 170280, 186497, 203845, 222377, 242144]

cp's OEIS Frontend

A011931 a(n) = floor(n(n-1)(n-2)*(n-3)/21).

Table of values

List of values

cp's OEIS Frontend

A011931 a(n) = floor(n*(n-1)*(n-2)*(n-3)/21).

Table of values

List of values

A011931 a(n) = floor(n(n-1)(n-2)*(n-3)/21).