A386942 - cp's OEIS frontend

A386942 a(n) = Sum_{k=0..n} (2k+1) binomial(2k,k) binomial(2*n-k,n-k).

n	a(n)
0	1
1	8
2	54
3	340
4	2060
5	12180
6	70812
7	406656
8	2313630
9	13067340
10	73372728
11	410013864
12	2282066332
13	12658839200
14	70017730680
15	386314361808
16	2126818591932
17	11686657363236
18	64108376373700
19	351142219736000
20	1920711937207140
21	10493241496749000
22	57263080117042800

[1, 8, 54, 340, 2060, 12180, 70812, 406656, 2313630, 13067340, 73372728, 410013864, 2282066332, 12658839200, 70017730680, 386314361808, 2126818591932, 11686657363236, 64108376373700, 351142219736000, 1920711937207140, 10493241496749000, 57263080117042800]

cp's OEIS Frontend

A386942 a(n) = Sum_{k=0..n} (2k+1) binomial(2k,k) binomial(2*n-k,n-k).

Table of values

List of values

cp's OEIS Frontend

A386942 a(n) = Sum_{k=0..n} (2*k+1) * binomial(2*k,k) * binomial(2*n-k,n-k).

Table of values

List of values

A386942 a(n) = Sum_{k=0..n} (2k+1) binomial(2k,k) binomial(2*n-k,n-k).