A323776 - cp's OEIS frontend

A323776 a(n) = Sum_{k = 1...n} binomial(k + 2^(n - k) - 1, k - 1).

n	a(n)
1	1
2	3
3	7
4	16
5	40
6	119
7	450
8	2253
9	15207
10	139190
11	1731703
12	29335875
13	677864041
14	21400069232
15	924419728471
16	54716596051100
17	4443400439075834
18	495676372493566749
19	76041424515817042402
20	16060385520094706930608
21	4674665948889147697184915

[1, 3, 7, 16, 40, 119, 450, 2253, 15207, 139190, 1731703, 29335875, 677864041, 21400069232, 924419728471, 54716596051100, 4443400439075834, 495676372493566749, 76041424515817042402, 16060385520094706930608, 4674665948889147697184915]

cp's OEIS Frontend

A323776 a(n) = Sum_{k = 1...n} binomial(k + 2^(n - k) - 1, k - 1).

Table of values

List of values