A371372 - cp's OEIS frontend

A371372 a(n) = Sum_{d|2n} binomial(4n/d-1, 2n/d)phi(d)/(4*n) for n>0 with a(0)=0.

n	a(n)
0	0
1	1
2	5
3	40
4	405
5	4626
6	56360
7	716430
8	9392085
9	126044248
10	1723083930
11	23910223514
12	335912566824
13	4768447532200
14	68291880722182
15	985538181002940
16	14317376105810133
17	209213540276280758
18	3073003751985537656
19	45346188478477675122
20	671920054584212646330
21	9993514798883508502188

[0, 1, 5, 40, 405, 4626, 56360, 716430, 9392085, 126044248, 1723083930, 23910223514, 335912566824, 4768447532200, 68291880722182, 985538181002940, 14317376105810133, 209213540276280758, 3073003751985537656, 45346188478477675122, 671920054584212646330, 9993514798883508502188]

cp's OEIS Frontend

A371372 a(n) = Sum_{d|2n} binomial(4n/d-1, 2n/d)phi(d)/(4*n) for n>0 with a(0)=0.

Table of values

List of values

cp's OEIS Frontend

A371372 a(n) = Sum_{d|2*n} binomial(4*n/d-1, 2*n/d)*phi(d)/(4*n) for n>0 with a(0)=0.

Table of values

List of values

A371372 a(n) = Sum_{d|2n} binomial(4n/d-1, 2n/d)phi(d)/(4*n) for n>0 with a(0)=0.