A249562 - cp's OEIS frontend

A249562 Number of length n permutations avoiding (123,{2},{}) and (123,{},{1}).

n	a(n)
0	1
1	1
2	2
3	5
4	14
5	43
6	143
7	509
8	1921
9	7631
10	31725
11	137412
12	617822
13	2874819
14	13809305
15	68331089
16	347657464
17	1815839759
18	9722708061
19	53301771604
20	298854490602
21	1712023130016
22	10011533550216
23	59714205975048
24	363008132101658
25	2247599137530241
26	14164805684388087
27	90810818671081267
28	591921142070249872

[1, 1, 2, 5, 14, 43, 143, 509, 1921, 7631, 31725, 137412, 617822, 2874819, 13809305, 68331089, 347657464, 1815839759, 9722708061, 53301771604, 298854490602, 1712023130016, 10011533550216, 59714205975048, 363008132101658, 2247599137530241, 14164805684388087, 90810818671081267, 591921142070249872]

cp's OEIS Frontend

A249562 Number of length n permutations avoiding (123,{2},{}) and (123,{},{1}).

Table of values

List of values