A183155 - cp's OEIS frontend

A183155 The number of order-preserving partial isometries (of an n-chain) of fix zero (fix of alpha = 0). Equivalently, the number of order-preserving partial derangement isometries (of an n-chain).

n	a(n)
0	1
1	1
2	3
3	9
4	23
5	53
6	115
7	241
8	495
9	1005
10	2027
11	4073
12	8167
13	16357
14	32739
15	65505
16	131039
17	262109
18	524251
19	1048537
20	2097111
21	4194261
22	8388563
23	16777169
24	33554383
25	67108813
26	134217675
27	268435401
28	536870855
29	1073741765

[1, 1, 3, 9, 23, 53, 115, 241, 495, 1005, 2027, 4073, 8167, 16357, 32739, 65505, 131039, 262109, 524251, 1048537, 2097111, 4194261, 8388563, 16777169, 33554383, 67108813, 134217675, 268435401, 536870855, 1073741765]

cp's OEIS Frontend

A183155 The number of order-preserving partial isometries (of an n-chain) of fix zero (fix of alpha = 0). Equivalently, the number of order-preserving partial derangement isometries (of an n-chain).

Table of values

List of values