A371399 - cp's OEIS frontend

A371399 a(n) = 2^n * Sum_{k=0..n} binomial(k + n, k) * binomial(2n - k, n) (-1/2)^k.

n	a(n)
0	1
1	2
2	12
3	60
4	340
5	1932
6	11256
7	66264
8	394020
9	2359500
10	14211912
11	86004360
12	522502344
13	3184844600
14	19467675120
15	119288938800
16	732508344516
17	4506518476620
18	27771180181800
19	171393806476200
20	1059200506065240
21	6553715347503720
22	40595235803924880
23	251709010315822800

[1, 2, 12, 60, 340, 1932, 11256, 66264, 394020, 2359500, 14211912, 86004360, 522502344, 3184844600, 19467675120, 119288938800, 732508344516, 4506518476620, 27771180181800, 171393806476200, 1059200506065240, 6553715347503720, 40595235803924880, 251709010315822800]

cp's OEIS Frontend

A371399 a(n) = 2^n * Sum_{k=0..n} binomial(k + n, k) * binomial(2n - k, n) (-1/2)^k.

Table of values

List of values

cp's OEIS Frontend

A371399 a(n) = 2^n * Sum_{k=0..n} binomial(k + n, k) * binomial(2*n - k, n) * (-1/2)^k.

Table of values

List of values

A371399 a(n) = 2^n * Sum_{k=0..n} binomial(k + n, k) * binomial(2n - k, n) (-1/2)^k.