A277956 - cp's OEIS frontend

A277956 a(n) = (n+2)Sum_{i=0..n}(binomial(3n-2i+1, n-i)/(2n-i+2)).

n	a(n)
0	1
1	4
2	19
3	101
4	573
5	3382
6	20483
7	126292
8	788878
9	4976489
10	31635811
11	202354517
12	1300880374
13	8398175713
14	54409200963
15	353571026085
16	2303666554659
17	15043760670031
18	98439176169692
19	645290365460761
20	4236768489465944
21	27857102370774193

[1, 4, 19, 101, 573, 3382, 20483, 126292, 788878, 4976489, 31635811, 202354517, 1300880374, 8398175713, 54409200963, 353571026085, 2303666554659, 15043760670031, 98439176169692, 645290365460761, 4236768489465944, 27857102370774193]

cp's OEIS Frontend

A277956 a(n) = (n+2)Sum_{i=0..n}(binomial(3n-2i+1, n-i)/(2n-i+2)).

Table of values

List of values

cp's OEIS Frontend

A277956 a(n) = (n+2)*Sum_{i=0..n}(binomial(3*n-2*i+1, n-i)/(2*n-i+2)).

Table of values

List of values

A277956 a(n) = (n+2)Sum_{i=0..n}(binomial(3n-2i+1, n-i)/(2n-i+2)).