Number of adjacent pairs of form (even,even) among all permutations of {1,2,...,n}.
A077612
Number of adjacent pairs of form (even,even) among all permutations of {1,2,...,n}.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =12a(4) =48a(5) =720a(6) =4320a(7) =60480a(8) =483840a(9) =7257600a(10) =72576000a(11) =1197504000a(12) =14370048000a(13) =261534873600
External references
- oeis: A077612