A002468 - cp's OEIS frontend

A002468 The game of Mousetrap with n cards: the number of permutations of n cards having at least one hit after 2.

n	a(n)
1	0
2	0
3	1
4	3
5	13
6	65
7	397
8	2819
9	22831
10	207605
11	2094121
12	23205383
13	280224451
14	3662810249
15	51523391965
16	776082247979
17	12463259986087
18	212573743211549
19	3837628837381201
20	73108996989052175
21	1465703611456618891
22	30847249002794047793
23	679998362512214208901
24	15668677914172813691699
25	376683592679293811722735

[0, 0, 1, 3, 13, 65, 397, 2819, 22831, 207605, 2094121, 23205383, 280224451, 3662810249, 51523391965, 776082247979, 12463259986087, 212573743211549, 3837628837381201, 73108996989052175, 1465703611456618891, 30847249002794047793, 679998362512214208901, 15668677914172813691699, 376683592679293811722735]

cp's OEIS Frontend

A002468 The game of Mousetrap with n cards: the number of permutations of n cards having at least one hit after 2.

Table of values

List of values