A360143 - cp's OEIS frontend

A360143 a(n) = Sum_{k=0..n} binomial(2n+2k,n-k).

n	a(n)
0	1
1	3
2	13
3	59
4	271
5	1250
6	5775
7	26696
8	123423
9	570576
10	2637306
11	12187755
12	56312089
13	260134905
14	1201493926
15	5548533913
16	25619837773
17	118283258215
18	546041467522
19	2520515546083
20	11633752319476
21	53693477980816
22	247798435809211
23	1143547904185879
24	5277058908767419

[1, 3, 13, 59, 271, 1250, 5775, 26696, 123423, 570576, 2637306, 12187755, 56312089, 260134905, 1201493926, 5548533913, 25619837773, 118283258215, 546041467522, 2520515546083, 11633752319476, 53693477980816, 247798435809211, 1143547904185879, 5277058908767419]

cp's OEIS Frontend

A360143 a(n) = Sum_{k=0..n} binomial(2n+2k,n-k).

Table of values

List of values

cp's OEIS Frontend

A360143 a(n) = Sum_{k=0..n} binomial(2*n+2*k,n-k).

Table of values

List of values

A360143 a(n) = Sum_{k=0..n} binomial(2n+2k,n-k).