Number of permutations of 1..n with no element e[i>=2]<e[1+floor((i-2)/6)] (6-way heap).
A178011
Number of permutations of 1..n with no element e[i>=2]<e[1+floor((i-2)/6)] (6-way heap).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =24a(6) =120a(7) =720a(8) =2520a(9) =13440a(10) =90720a(11) =725760a(12) =6652800a(13) =68428800a(14) =444787200a(15) =4151347200a(16) =46702656000a(17) =597793996800
External references
- oeis: A178011