A360186 - cp's OEIS frontend

A360186 a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(2n-6k,n-3*k).

n	a(n)
0	1
1	2
2	6
3	19
4	68
5	246
6	905
7	3364
8	12624
9	47715
10	181392
11	692808
12	2656441
13	10219208
14	39423792
15	152461079
16	590861182
17	2294182428
18	8922674221
19	34754402618
20	135552346392
21	529335200219
22	2069344561102
23	8097878381208
24	31718268482881
25	124341261876650

[1, 2, 6, 19, 68, 246, 905, 3364, 12624, 47715, 181392, 692808, 2656441, 10219208, 39423792, 152461079, 590861182, 2294182428, 8922674221, 34754402618, 135552346392, 529335200219, 2069344561102, 8097878381208, 31718268482881, 124341261876650]

cp's OEIS Frontend

A360186 a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(2n-6k,n-3*k).

Table of values

List of values

cp's OEIS Frontend

A360186 a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(2*n-6*k,n-3*k).

Table of values

List of values

A360186 a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(2n-6k,n-3*k).