A078009 - cp's OEIS frontend

A078009 a(0)=1, for n>=1 a(n) = Sum_{k=0..n} 5^kN(n,k) where N(n,k) = C(n,k)C(n,k+1)/n are the Narayana numbers (A001263).

n	a(n)
0	1
1	1
2	6
3	41
4	306
5	2426
6	20076
7	171481
8	1500666
9	13386206
10	121267476
11	1112674026
12	10318939956
13	96572168916
14	910896992856
15	8650566601401
16	82644968321226
17	793753763514806
18	7659535707782916
19	74225795172589006
20	722042370787826076

[1, 1, 6, 41, 306, 2426, 20076, 171481, 1500666, 13386206, 121267476, 1112674026, 10318939956, 96572168916, 910896992856, 8650566601401, 82644968321226, 793753763514806, 7659535707782916, 74225795172589006, 722042370787826076]

cp's OEIS Frontend

A078009 a(0)=1, for n>=1 a(n) = Sum_{k=0..n} 5^kN(n,k) where N(n,k) = C(n,k)C(n,k+1)/n are the Narayana numbers (A001263).

Table of values

List of values

cp's OEIS Frontend

A078009 a(0)=1, for n>=1 a(n) = Sum_{k=0..n} 5^k*N(n,k) where N(n,k) = C(n,k)*C(n,k+1)/n are the Narayana numbers (A001263).

Table of values

List of values

A078009 a(0)=1, for n>=1 a(n) = Sum_{k=0..n} 5^kN(n,k) where N(n,k) = C(n,k)C(n,k+1)/n are the Narayana numbers (A001263).