A293579 - cp's OEIS frontend

A293579 Number of compositions of n where each part i is marked with a word of length i over a binary alphabet whose letters appear in alphabetical order and both letters occur at least once in the composition.

n	a(n)
2	3
3	16
4	66
5	248
6	892
7	3136
8	10888
9	37536
10	128880
11	441472
12	1510176
13	5161856
14	17635264
15	60233728
16	205697152
17	702386688
18	2398283520
19	8188622848
20	27958448640
21	95457597440
22	325915589632
23	1112751357952
24	3799182641152
25	12971244625920
26	44286646775808
27	151204164960256

[3, 16, 66, 248, 892, 3136, 10888, 37536, 128880, 441472, 1510176, 5161856, 17635264, 60233728, 205697152, 702386688, 2398283520, 8188622848, 27958448640, 95457597440, 325915589632, 1112751357952, 3799182641152, 12971244625920, 44286646775808, 151204164960256]

cp's OEIS Frontend

A293579 Number of compositions of n where each part i is marked with a word of length i over a binary alphabet whose letters appear in alphabetical order and both letters occur at least once in the composition.

Table of values

List of values