A287583 - cp's OEIS frontend

A287583 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks and between consecutive elements within the blocks are not larger than four.

n	a(n)
0	1
1	1
2	2
3	5
4	15
5	52
6	187
7	677
8	2439
9	8707
10	30871
11	108696
12	380653
13	1328193
14	4623194
15	16065161
16	55763738
17	193430602
18	670683122
19	2324853720
20	8057594663
21	27923827498
22	96765523944
23	335314355594
24	1161917842116
25	4026187435945
26	13951144657754
27	48341945365173

[1, 1, 2, 5, 15, 52, 187, 677, 2439, 8707, 30871, 108696, 380653, 1328193, 4623194, 16065161, 55763738, 193430602, 670683122, 2324853720, 8057594663, 27923827498, 96765523944, 335314355594, 1161917842116, 4026187435945, 13951144657754, 48341945365173]

cp's OEIS Frontend

A287583 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks and between consecutive elements within the blocks are not larger than four.

Table of values

List of values