A360211 - cp's OEIS frontend

A360211 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(2n-3k,n-2*k).

n	a(n)
0	1
1	2
2	5
3	17
4	61
5	221
6	812
7	3021
8	11344
9	42899
10	163146
11	623320
12	2390653
13	9198879
14	35494701
15	137290466
16	532149805
17	2066501909
18	8038146035
19	31312535610
20	122140123201
21	477002869614
22	1864912495716
23	7298427590543
24	28588888586743
25	112080607196843
26	439744801379594

[1, 2, 5, 17, 61, 221, 812, 3021, 11344, 42899, 163146, 623320, 2390653, 9198879, 35494701, 137290466, 532149805, 2066501909, 8038146035, 31312535610, 122140123201, 477002869614, 1864912495716, 7298427590543, 28588888586743, 112080607196843, 439744801379594]

cp's OEIS Frontend

A360211 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(2n-3k,n-2*k).

Table of values

List of values

cp's OEIS Frontend

A360211 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(2*n-3*k,n-2*k).

Table of values

List of values

A360211 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(2n-3k,n-2*k).