Total number of occurrences of 2 in the (signed) displacement sets of all permutations of [n+2] divided by 2!.
A324352
Total number of occurrences of 2 in the (signed) displacement sets of all permutations of [n+2] divided by 2!.
Terms
- a(0) =0a(1) =1a(2) =5a(3) =28a(4) =179a(5) =1306a(6) =10757a(7) =98932a(8) =1006007a(9) =11214406a(10) =136041329a(11) =1784556808a(12) =25174694723a(13) =380087428618
External references
- oeis: A324352