A143948 - cp's OEIS frontend

A143948 Number of permutations of some {1,2,...,k} in which the sum of the positions of the right-to-left minima is n.

n	a(n)
0	1
1	1
2	1
3	3
4	7
5	28
6	130
7	759
8	5206
9	41260
10	369043
11	3676429
12	40334375
13	483102302
14	6271504796
15	87706308280
16	1314478069758
17	21017345072301
18	357096995609668
19	6424807487105280
20	122024726484398199
21	2439707860612958618
22	51219795310622022600
23	1126569670246506800519

[1, 1, 1, 3, 7, 28, 130, 759, 5206, 41260, 369043, 3676429, 40334375, 483102302, 6271504796, 87706308280, 1314478069758, 21017345072301, 357096995609668, 6424807487105280, 122024726484398199, 2439707860612958618, 51219795310622022600, 1126569670246506800519]

cp's OEIS Frontend

A143948 Number of permutations of some {1,2,...,k} in which the sum of the positions of the right-to-left minima is n.

Table of values

List of values