A369584 - cp's OEIS frontend

A369584 a(n) = 2^(n - 3) - A368279(n) for n >= 5, otherwise 0. Number of compositions of n whose first and last part is not equal to 1 and whose first part is not the largest part.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	2
7	6
8	13
9	30
10	65
11	140
12	296
13	622
14	1294
15	2679
16	5518
17	11323
18	23160
19	47250
20	96184
21	195438
22	396490
23	803292
24	1625591
25	3286340
26	6637913
27	13397224
28	27020974
29	54465702
30	109725932
31	220944768
32	444700208
33	894701728
34	1799419458
35	3617792587
36	7271505058

[0, 0, 0, 0, 0, 1, 2, 6, 13, 30, 65, 140, 296, 622, 1294, 2679, 5518, 11323, 23160, 47250, 96184, 195438, 396490, 803292, 1625591, 3286340, 6637913, 13397224, 27020974, 54465702, 109725932, 220944768, 444700208, 894701728, 1799419458, 3617792587, 7271505058]

cp's OEIS Frontend

A369584 a(n) = 2^(n - 3) - A368279(n) for n >= 5, otherwise 0. Number of compositions of n whose first and last part is not equal to 1 and whose first part is not the largest part.

Table of values

List of values