A360294 - cp's OEIS frontend

A360294 a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(n-1-2k,k) binomial(2n-6k,n-3*k).

n	a(n)
0	1
1	2
2	6
3	20
4	68
5	240
6	864
7	3154
8	11628
9	43196
10	161430
11	606228
12	2285780
13	8647738
14	32811378
15	124804104
16	475748330
17	1817005536
18	6951390372
19	26634502642
20	102189927918
21	392559063268
22	1509684132394
23	5811772604124
24	22394185567728
25	86364110132930
26	333329513935842

[1, 2, 6, 20, 68, 240, 864, 3154, 11628, 43196, 161430, 606228, 2285780, 8647738, 32811378, 124804104, 475748330, 1817005536, 6951390372, 26634502642, 102189927918, 392559063268, 1509684132394, 5811772604124, 22394185567728, 86364110132930, 333329513935842]

cp's OEIS Frontend

A360294 a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(n-1-2k,k) binomial(2n-6k,n-3*k).

Table of values

List of values

cp's OEIS Frontend

A360294 a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(n-1-2*k,k) * binomial(2*n-6*k,n-3*k).

Table of values

List of values

A360294 a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(n-1-2k,k) binomial(2n-6k,n-3*k).