A124431 - cp's OEIS frontend

A124431 a(n) = Sum_{k=0..n} 2^kC([(n+k)/2],k)C([(n+k+1)/2],k) where [x]=floor(x).

n	a(n)
0	1
1	3
2	9
3	29
4	97
5	331
6	1145
7	4001
8	14089
9	49915
10	177713
11	635293
12	2278841
13	8198227
14	29567729
15	106872961
16	387038993
17	1404052659
18	5101219929
19	18559193245
20	67605310097
21	246541193883
22	899999057385
23	3288522934433
24	12026324883865

[1, 3, 9, 29, 97, 331, 1145, 4001, 14089, 49915, 177713, 635293, 2278841, 8198227, 29567729, 106872961, 387038993, 1404052659, 5101219929, 18559193245, 67605310097, 246541193883, 899999057385, 3288522934433, 12026324883865]

cp's OEIS Frontend

A124431 a(n) = Sum_{k=0..n} 2^kC([(n+k)/2],k)C([(n+k+1)/2],k) where [x]=floor(x).

Table of values

List of values

cp's OEIS Frontend

A124431 a(n) = Sum_{k=0..n} 2^k*C([(n+k)/2],k)*C([(n+k+1)/2],k) where [x]=floor(x).

Table of values

List of values

A124431 a(n) = Sum_{k=0..n} 2^kC([(n+k)/2],k)C([(n+k+1)/2],k) where [x]=floor(x).