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%I #5 May 13 2022 09:53:00
%S 0,2,4,4,8,8,81,16,81,256,1024,1024,4096,729,4096,15625,78125,16384,
%T 390625,65536,390625,1679616,10077696,10077696,10077696,10077696,
%U 40353607,40353607,282475249,282475249,8589934592,1977326743,1977326743,8589934592,8589934592,31381059609,1000000000000
%N a(n) = (pi(2n-1) - pi(n-1))^pi(n) for n > 1, a(1) = 0.
%C Number of functions from P to Q, where P is the set of primes <= n and Q is the set of primes q such that n <= q <= 2n-1.
%F a(n) = A035250(n)^A000720(n) for n > 1, a(1) = 0.
%t Join[{0}, Table[(PrimePi[2 n - 1] - PrimePi[n - 1])^PrimePi[n], {n, 2, 30}]]
%Y Cf. A000720 (pi), A035250, A352749.
%K nonn
%O 1,2
%A _Wesley Ivan Hurt_, May 12 2022
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