A143017 - cp's OEIS frontend

A143017 Number of {2-1-3, 2'^e-31}-avoiding permutations of size n (see definition in the Elizalde paper).

n	a(n)
1	1
2	2
3	4
4	9
5	22
6	56
7	147
8	396
9	1088
10	3036
11	8582
12	24524
13	70727
14	205594
15	601756
16	1771937
17	5245544
18	15602496
19	46606356
20	139753120
21	420520000
22	1269361000
23	3842722454
24	11663928644
25	35490451807
26	108232655126
27	330760284892

[1, 2, 4, 9, 22, 56, 147, 396, 1088, 3036, 8582, 24524, 70727, 205594, 601756, 1771937, 5245544, 15602496, 46606356, 139753120, 420520000, 1269361000, 3842722454, 11663928644, 35490451807, 108232655126, 330760284892]

cp's OEIS Frontend

A143017 Number of {2-1-3, 2'^e-31}-avoiding permutations of size n (see definition in the Elizalde paper).

Table of values

List of values