A360266 - cp's OEIS frontend

A360266 a(n) = Sum_{k=0..floor(n/3)} binomial(n-2k,k) binomial(2(n-2k),n-2*k).

n	a(n)
0	1
1	2
2	6
3	22
4	82
5	312
6	1210
7	4752
8	18834
9	75184
10	301856
11	1217604
12	4930626
13	20032052
14	81615072
15	333328532
16	1364264250
17	5594210292
18	22977466864
19	94517423444
20	389316529512
21	1605533230256
22	6628467569292
23	27393187077144
24	113310732332274
25	469101108803052

[1, 2, 6, 22, 82, 312, 1210, 4752, 18834, 75184, 301856, 1217604, 4930626, 20032052, 81615072, 333328532, 1364264250, 5594210292, 22977466864, 94517423444, 389316529512, 1605533230256, 6628467569292, 27393187077144, 113310732332274, 469101108803052]

cp's OEIS Frontend

A360266 a(n) = Sum_{k=0..floor(n/3)} binomial(n-2k,k) binomial(2(n-2k),n-2*k).

Table of values

List of values

cp's OEIS Frontend

A360266 a(n) = Sum_{k=0..floor(n/3)} binomial(n-2*k,k) * binomial(2*(n-2*k),n-2*k).

Table of values

List of values

A360266 a(n) = Sum_{k=0..floor(n/3)} binomial(n-2k,k) binomial(2(n-2k),n-2*k).