A172385 - cp's OEIS frontend

A172385 a(n) = 1 if n=0, otherwise Sum_{k=0..floor((n-1)/2)} binomial(n-k-1, k) (-1)^ka(n-1-2k).

n	a(n)
0	1
1	1
2	1
3	0
4	-2
5	-4
6	-1
7	14
8	34
9	2
10	-189
11	-439
12	263
13	3796
14	6997
15	-14437
16	-96643
17	-106774
18	671097
19	2800836
20	57519
21	-31088662
22	-82674287
23	155322877
24	1455331563
25	1936970102
26	-14267868745
27	-66446614533
28	19215003803
29	1037638182571
30	2654391633166
31	-8675836955120
32	-67833031653088

[1, 1, 1, 0, -2, -4, -1, 14, 34, 2, -189, -439, 263, 3796, 6997, -14437, -96643, -106774, 671097, 2800836, 57519, -31088662, -82674287, 155322877, 1455331563, 1936970102, -14267868745, -66446614533, 19215003803, 1037638182571, 2654391633166, -8675836955120, -67833031653088]

cp's OEIS Frontend

A172385 a(n) = 1 if n=0, otherwise Sum_{k=0..floor((n-1)/2)} binomial(n-k-1, k) (-1)^ka(n-1-2k).

Table of values

List of values

cp's OEIS Frontend

A172385 a(n) = 1 if n=0, otherwise Sum_{k=0..floor((n-1)/2)} binomial(n-k-1, k) *(-1)^k*a(n-1-2k).

Table of values

List of values

A172385 a(n) = 1 if n=0, otherwise Sum_{k=0..floor((n-1)/2)} binomial(n-k-1, k) (-1)^ka(n-1-2k).