A253409 - cp's OEIS frontend

A253409 The number of ways to write an n-bit binary string and then define each run of ones as an element in an equivalence relation, and each run of zeros as an element in a second equivalence relation.

n	a(n)
0	1
1	2
2	4
3	10
4	28
5	86
6	282
7	984
8	3630
9	14138
10	57904
11	248854
12	1118554
13	5246980
14	25619018
15	129961850
16	683561488
17	3722029314
18	20946195078
19	121671375312
20	728511702462
21	4491224518274
22	28475638336144
23	185499720543262
24	1240358846060122
25	8505894459387628
26	59771243719783410

[1, 2, 4, 10, 28, 86, 282, 984, 3630, 14138, 57904, 248854, 1118554, 5246980, 25619018, 129961850, 683561488, 3722029314, 20946195078, 121671375312, 728511702462, 4491224518274, 28475638336144, 185499720543262, 1240358846060122, 8505894459387628, 59771243719783410]

cp's OEIS Frontend

A253409 The number of ways to write an n-bit binary string and then define each run of ones as an element in an equivalence relation, and each run of zeros as an element in a second equivalence relation.

Table of values

List of values