Number of anti-run permutations of the prime indices of Mersenne numbers A000225(n) = 2^n - 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =1a(6) =1a(7) =6a(8) =2a(9) =6a(10) =2a(11) =36a(12) =1a(13) =6a(14) =6a(15) =24a(16) =1a(17) =24a(18) =1a(19) =240a(20) =6a(21) =24a(22) =2a(23) =1800a(24) =6a(25) =6a(26) =6a(27) =720a(28) =6a(29) =1800