A272080 Row sums of A238498.

1, 2, 5, 10, 22, 38, 110, 178, 378, 698, 1766, 2618, 7442, 11006, 26482, 58226, 123698, 178310, 502490, 719802, 1814954, 3737154, 8601674, 11944562, 33535586, 54001022, 120654206, 217935362, 518197346, 718356542, 2441734706, 3392584002, 7055236194, 13981570658

Offset

0,2

Links

Table of n, a(n) for n=0..33.

Tom Edgar, Totienomial Coefficients, INTEGERS, 14 (2014), #A62.

Prog

(SageMath) P=[0]+[i*prod([(1+1/x) for x in prime_divisors(i)]) for i in [1..100]]
Tr=[[prod(P[1:n+1])/(prod(P[1:k+1])*prod(P[1:(n-k)+1])) for k in [0..n]] for n in [0..len(P)-1]]
print([sum(x) for x in Tr])

Crossrefs

Cf. A001615, A238498.

Sequence in context: A110744 A079342 A034456 * A002512 A097096 A073777

Adjacent sequences: A272077 A272078 A272079 * A272081 A272082 A272083

Keyword

nonn

Author

Tom Edgar, Apr 19 2016

Status

approved