Number of distinct values taken by the entropy for permutations of [1..n], where the entropy of a permutation pi is Sum_{k=1..n} (pi(k)-k)^2.

A126972

Number of distinct values taken by the entropy for permutations of [1..n], where the entropy of a permutation pi is Sum_{k=1..n} (pi(k)-k)^2.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =21a(6) =36a(7) =57a(8) =85a(9) =121a(10) =166a(11) =221a(12) =287a(13) =365a(14) =456a(15) =561a(16) =681a(17) =817a(18) =970a(19) =1141a(20) =1331a(21) =1541a(22) =1772a(23) =2025a(24) =2301a(25) =2601a(26) =2926a(27) =3277a(28) =3655a(29) =4061

External references