A005285 - cp's OEIS frontend

A005285 Number of permutations of (1,...,n) having n-7 inversions (n>=7).

n	a(n)
7	1
8	7
9	35
10	155
11	649
12	2640
13	10569
14	41926
15	165425
16	650658
17	2554607
18	10020277
19	39287173
20	154022930
21	603919164
22	2368601685
23	9293159292
24	36476745510
25	143239635450
26	562744102479
27	2211876507387
28	8697839966552
29	34218338900591

[1, 7, 35, 155, 649, 2640, 10569, 41926, 165425, 650658, 2554607, 10020277, 39287173, 154022930, 603919164, 2368601685, 9293159292, 36476745510, 143239635450, 562744102479, 2211876507387, 8697839966552, 34218338900591]

cp's OEIS Frontend

A005285 Number of permutations of (1,...,n) having n-7 inversions (n>=7).

Table of values

List of values