A010029 - cp's OEIS frontend

A010029 Irregular triangle read by rows: T(n,k) (n>=1, 0 <= k <= floor(n/2)) = number of permutations of 1..n with exactly floor(n/2) - k runs of consecutive pairs up.

n	a(n)
1	1
2	1
3	1
4	3
5	3
6	1
7	12
8	11
9	11
10	56
11	53
12	3
13	87
14	321
15	309
16	53
17	693
18	2175
19	2119
20	11
21	680
22	5934
23	17008
24	16687
25	309
26	8064
27	55674
28	150504
29	148329
30	53
31	5805
32	96370
33	572650
34	1485465
35	1468457
36	2119
37	95575

[1, 1, 1, 3, 3, 1, 12, 11, 11, 56, 53, 3, 87, 321, 309, 53, 693, 2175, 2119, 11, 680, 5934, 17008, 16687, 309, 8064, 55674, 150504, 148329, 53, 5805, 96370, 572650, 1485465, 1468457, 2119, 95575]

cp's OEIS Frontend

A010029 Irregular triangle read by rows: T(n,k) (n>=1, 0 <= k <= floor(n/2)) = number of permutations of 1..n with exactly floor(n/2) - k runs of consecutive pairs up.

Table of values

List of values