A383573 - cp's OEIS frontend

A383573 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k,k) * binomial(2(n-2k),n-2*k).

n	a(n)
0	1
1	2
2	7
3	24
4	89
5	338
6	1311
7	5152
8	20449
9	81778
10	328999
11	1330008
12	5398265
13	21984610
14	89791103
15	367643776
16	1508560257
17	6201927074
18	25540266503
19	105336838616
20	435035342553
21	1798875915826
22	7446653956895
23	30857577536800
24	127987031688161
25	531301328367762
26	2207281722474919

[1, 2, 7, 24, 89, 338, 1311, 5152, 20449, 81778, 328999, 1330008, 5398265, 21984610, 89791103, 367643776, 1508560257, 6201927074, 25540266503, 105336838616, 435035342553, 1798875915826, 7446653956895, 30857577536800, 127987031688161, 531301328367762, 2207281722474919]

cp's OEIS Frontend

A383573 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k,k) * binomial(2(n-2k),n-2*k).

Table of values

List of values

cp's OEIS Frontend

A383573 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k,k) * binomial(2*(n-2*k),n-2*k).

Table of values

List of values

A383573 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k,k) * binomial(2(n-2k),n-2*k).