A371815 - cp's OEIS frontend

A371815 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(4n-2k-1,n-2*k).

n	a(n)
0	1
1	3
2	20
3	156
4	1288
5	10963
6	95132
7	836650
8	7430956
9	66501696
10	598720080
11	5416612336
12	49201807276
13	448442474938
14	4099103160424
15	37562606691526
16	344959939645980
17	3174051631201636
18	29254814741949680
19	270047153053464712
20	2496167217049673468

[1, 3, 20, 156, 1288, 10963, 95132, 836650, 7430956, 66501696, 598720080, 5416612336, 49201807276, 448442474938, 4099103160424, 37562606691526, 344959939645980, 3174051631201636, 29254814741949680, 270047153053464712, 2496167217049673468]

cp's OEIS Frontend

A371815 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(4n-2k-1,n-2*k).

Table of values

List of values

cp's OEIS Frontend

A371815 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(4*n-2*k-1,n-2*k).

Table of values

List of values

A371815 a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(4n-2k-1,n-2*k).