A133444 - cp's OEIS frontend

A133444 a(n)=sum{k=0..n, C(n,floor(k/2))(-1)^k4^(n-k)}.

n	a(n)
0	1
1	3
2	14
3	57
4	246
5	1038
6	4424
7	18777
8	79846
9	339258
10	1442004
11	6128202
12	26045436
13	110691948
14	470442924
15	1999378137
16	8497365126
17	36113785698
18	153483619604
19	652305322542
20	2772297736276
21	11782265148228
22	50074627320864
23	212817165231882
24	904472953925596

[1, 3, 14, 57, 246, 1038, 4424, 18777, 79846, 339258, 1442004, 6128202, 26045436, 110691948, 470442924, 1999378137, 8497365126, 36113785698, 153483619604, 652305322542, 2772297736276, 11782265148228, 50074627320864, 212817165231882, 904472953925596]

cp's OEIS Frontend

A133444 a(n)=sum{k=0..n, C(n,floor(k/2))(-1)^k4^(n-k)}.

Table of values

List of values

cp's OEIS Frontend

A133444 a(n)=sum{k=0..n, C(n,floor(k/2))*(-1)^k*4^(n-k)}.

Table of values

List of values

A133444 a(n)=sum{k=0..n, C(n,floor(k/2))(-1)^k4^(n-k)}.