A387550 - cp's OEIS frontend

A387550 a(n) = (1/2) * Sum_{k=0..n} 2^k * binomial(2k+2,2n-2*k+1).

n	a(n)
0	1
1	4
2	16
3	72
4	316
5	1376
6	6016
7	26304
8	114960
9	502464
10	2196224
11	9599360
12	41957312
13	183389184
14	801566720
15	3503527936
16	15313395968
17	66932560896
18	292552200192
19	1278701856768
20	5589014330368
21	24428744679424
22	106774384771072
23	466694846300160
24	2039853285314560

[1, 4, 16, 72, 316, 1376, 6016, 26304, 114960, 502464, 2196224, 9599360, 41957312, 183389184, 801566720, 3503527936, 15313395968, 66932560896, 292552200192, 1278701856768, 5589014330368, 24428744679424, 106774384771072, 466694846300160, 2039853285314560]

cp's OEIS Frontend

A387550 a(n) = (1/2) * Sum_{k=0..n} 2^k * binomial(2k+2,2n-2*k+1).

Table of values

List of values

cp's OEIS Frontend

A387550 a(n) = (1/2) * Sum_{k=0..n} 2^k * binomial(2*k+2,2*n-2*k+1).

Table of values

List of values

A387550 a(n) = (1/2) * Sum_{k=0..n} 2^k * binomial(2k+2,2n-2*k+1).