A219587 - cp's OEIS frontend

A219587 Noncrossing, nonnesting, 2-arc-colored permutations on the set {1..n} where lower arcs even of different colors do not cross.

n	a(n)
0	1
1	2
2	8
3	40
4	224
5	1296
6	7568
7	44304
8	259536
9	1520656
10	8910160
11	52209040
12	305919696
13	1792542992
14	10503446608
15	61545189520
16	360625475024
17	2113093401616
18	12381720203088
19	72550979111824
20	425114158957776
21	2490966357221136
22	14595875630354000
23	85524874633320080

[1, 2, 8, 40, 224, 1296, 7568, 44304, 259536, 1520656, 8910160, 52209040, 305919696, 1792542992, 10503446608, 61545189520, 360625475024, 2113093401616, 12381720203088, 72550979111824, 425114158957776, 2490966357221136, 14595875630354000, 85524874633320080]

cp's OEIS Frontend

A219587 Noncrossing, nonnesting, 2-arc-colored permutations on the set {1..n} where lower arcs even of different colors do not cross.

Table of values

List of values