A043301 - cp's OEIS frontend

A043301 a(n) = 2^nSum_{k=0..n} (n+k)!/((n-k)!k!*4^k).

n	a(n)
0	1
1	3
2	13
3	77
4	591
5	5627
6	64261
7	857901
8	13125559
9	226566107
10	4357258269
11	92408688077
12	2142828858847
13	53940356223483
14	1464960933469429
15	42699628495507373
16	1329548327094606279
17	44045893308104036699
18	1546924459092019709581
19	57412388559637145401293

[1, 3, 13, 77, 591, 5627, 64261, 857901, 13125559, 226566107, 4357258269, 92408688077, 2142828858847, 53940356223483, 1464960933469429, 42699628495507373, 1329548327094606279, 44045893308104036699, 1546924459092019709581, 57412388559637145401293]

cp's OEIS Frontend

A043301 a(n) = 2^nSum_{k=0..n} (n+k)!/((n-k)!k!*4^k).

Table of values

List of values

cp's OEIS Frontend

A043301 a(n) = 2^n*Sum_{k=0..n} (n+k)!/((n-k)!*k!*4^k).

Table of values

List of values

A043301 a(n) = 2^nSum_{k=0..n} (n+k)!/((n-k)!k!*4^k).