Number of (n+1) X (2+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,0 0,1 1,0 -1,-2 or 0,2.
A264307
Number of (n+1) X (2+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,0 0,1 1,0 -1,-2 or 0,2.
Terms
- a(0) =6a(1) =20a(2) =68a(3) =240a(4) =832a(5) =2896a(6) =10080a(7) =35072a(8) =122048a(9) =424704a(10) =1477888a(11) =5142784a(12) =17895936a(13) =62274560a(14) =216704000a(15) =754089984a(16) =2624094208a(17) =9131364352a(18) =31775465472a(19) =110572765184a(20) =384772849664
External references
- oeis: A264307