A371798 - cp's OEIS frontend

A371798 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(2n-2k-1,n-2*k).

n	a(n)
0	1
1	1
2	2
3	7
4	26
5	96
6	356
7	1331
8	5014
9	19006
10	72412
11	277058
12	1063856
13	4097510
14	15823432
15	61245987
16	237536326
17	922906150
18	3591500972
19	13996328322
20	54614894396
21	213360770840
22	834409399672
23	3266370155262
24	12797894251276
25	50184309630196
26	196936674150296

[1, 1, 2, 7, 26, 96, 356, 1331, 5014, 19006, 72412, 277058, 1063856, 4097510, 15823432, 61245987, 237536326, 922906150, 3591500972, 13996328322, 54614894396, 213360770840, 834409399672, 3266370155262, 12797894251276, 50184309630196, 196936674150296]

cp's OEIS Frontend

A371798 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(2n-2k-1,n-2*k).

Table of values

List of values

cp's OEIS Frontend

A371798 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(2*n-2*k-1,n-2*k).

Table of values

List of values

A371798 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(2n-2k-1,n-2*k).