A371773 - cp's OEIS frontend

A371773 a(n) = Sum_{k=0..floor(n/3)} binomial(2n-k+1,n-3k).

n	a(n)
0	1
1	3
2	10
3	36
4	134
5	507
6	1937
7	7449
8	28783
9	111623
10	434130
11	1692387
12	6610292
13	25861384
14	101319095
15	397428091
16	1560588454
17	6133768656
18	24128550045
19	94986663925
20	374188128311
21	1474980414870
22	5817387549611
23	22955930045826
24	90629404431826
25	357960414264163

[1, 3, 10, 36, 134, 507, 1937, 7449, 28783, 111623, 434130, 1692387, 6610292, 25861384, 101319095, 397428091, 1560588454, 6133768656, 24128550045, 94986663925, 374188128311, 1474980414870, 5817387549611, 22955930045826, 90629404431826, 357960414264163]

cp's OEIS Frontend

A371773 a(n) = Sum_{k=0..floor(n/3)} binomial(2n-k+1,n-3k).

Table of values

List of values

cp's OEIS Frontend

A371773 a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-k+1,n-3*k).

Table of values

List of values

A371773 a(n) = Sum_{k=0..floor(n/3)} binomial(2n-k+1,n-3k).