A360295 - cp's OEIS frontend

A360295 a(n) = Sum_{k=0..floor(n/4)} (-1)^k * binomial(n-1-3k,k) binomial(2n-8k,n-4*k).

n	a(n)
0	1
1	2
2	6
3	20
4	70
5	250
6	912
7	3372
8	12590
9	47362
10	179230
11	681528
12	2601896
13	9966798
14	38288420
15	147453664
16	569092438
17	2200577502
18	8523612766
19	33064771524
20	128438624798
21	499525018638
22	1944918241388
23	7580283784548
24	29571439970136
25	115459524588322
26	451157870454298

[1, 2, 6, 20, 70, 250, 912, 3372, 12590, 47362, 179230, 681528, 2601896, 9966798, 38288420, 147453664, 569092438, 2200577502, 8523612766, 33064771524, 128438624798, 499525018638, 1944918241388, 7580283784548, 29571439970136, 115459524588322, 451157870454298]

cp's OEIS Frontend

A360295 a(n) = Sum_{k=0..floor(n/4)} (-1)^k * binomial(n-1-3k,k) binomial(2n-8k,n-4*k).

Table of values

List of values

cp's OEIS Frontend

A360295 a(n) = Sum_{k=0..floor(n/4)} (-1)^k * binomial(n-1-3*k,k) * binomial(2*n-8*k,n-4*k).

Table of values

List of values

A360295 a(n) = Sum_{k=0..floor(n/4)} (-1)^k * binomial(n-1-3k,k) binomial(2n-8k,n-4*k).