A370392 - cp's OEIS frontend

A370392 Number of permutations of [n] whose longest block is of length 3. A block of a permutation is a maximal sequence of consecutive integers which appear in consecutive positions.

n	a(n)
0	0
1	0
2	0
3	1
4	2
5	11
6	63
7	415
8	3121
9	26402
10	248429
11	2575936
12	29198926
13	359351878
14	4773277246
15	68078349863
16	1037820312090
17	16842621113247
18	289946286959875
19	5277826030457339
20	101291053229162471
21	2044252472193005928
22	43283094591188747415
23	959369370636209414390

[0, 0, 0, 1, 2, 11, 63, 415, 3121, 26402, 248429, 2575936, 29198926, 359351878, 4773277246, 68078349863, 1037820312090, 16842621113247, 289946286959875, 5277826030457339, 101291053229162471, 2044252472193005928, 43283094591188747415, 959369370636209414390]

cp's OEIS Frontend

A370392 Number of permutations of [n] whose longest block is of length 3. A block of a permutation is a maximal sequence of consecutive integers which appear in consecutive positions.

Table of values

List of values