A212501 - cp's OEIS frontend

A212501 Number of (w,x,y,z) with all terms in {1,...,n} and w > x < y >= z.

n	a(n)
0	0
1	0
2	2
3	13
4	45
5	115
6	245
7	462
8	798
9	1290
10	1980
11	2915
12	4147
13	5733
14	7735
15	10220
16	13260
17	16932
18	21318
19	26505
20	32585
21	39655
22	47817
23	57178
24	67850
25	79950
26	93600
27	108927
28	126063
29	145145
30	166315
31	189720
32	215512
33	243848
34	274890
35	308805

[0, 0, 2, 13, 45, 115, 245, 462, 798, 1290, 1980, 2915, 4147, 5733, 7735, 10220, 13260, 16932, 21318, 26505, 32585, 39655, 47817, 57178, 67850, 79950, 93600, 108927, 126063, 145145, 166315, 189720, 215512, 243848, 274890, 308805]

cp's OEIS Frontend

A212501 Number of (w,x,y,z) with all terms in {1,...,n} and w > x < y >= z.

Table of values

List of values