A180187 - cp's OEIS frontend

A180187 Number of successions in all the permutations p of [n] such that p(1)=1 and having no 3-sequences. A succession of a permutation p is a position i such that p(i +1) - p(i) = 1.

n	a(n)
1	0
2	1
3	0
4	3
5	14
6	72
7	468
8	3453
9	28782
10	267831
11	2752828
12	30984336
13	379125192
14	5011756625
15	71190365580
16	1081514329155
17	17499480412746
18	300473929597320
19	5457031426340748
20	104520033700333069
21	2105651342251571562

[0, 1, 0, 3, 14, 72, 468, 3453, 28782, 267831, 2752828, 30984336, 379125192, 5011756625, 71190365580, 1081514329155, 17499480412746, 300473929597320, 5457031426340748, 104520033700333069, 2105651342251571562]

cp's OEIS Frontend

A180187 Number of successions in all the permutations p of [n] such that p(1)=1 and having no 3-sequences. A succession of a permutation p is a position i such that p(i +1) - p(i) = 1.

Table of values

List of values