Number of length n+1 0..2 arrays with the sum of the squares of adjacent differences multiplied by some arrangement of +-1 equal to zero.

A250271

Number of length n+1 0..2 arrays with the sum of the squares of adjacent differences multiplied by some arrangement of +-1 equal to zero.

Terms

    a(0) =3a(1) =11a(2) =27a(3) =79a(4) =255a(5) =843a(6) =2763a(7) =8903a(8) =28215a(9) =88195a(10) =272739a(11) =836607a(12) =2550735a(13) =7742267a(14) =23423355a(15) =70695991a(16) =213005415a(17) =640982259a(18) =1927141011a(19) =5790335855a(20) =17389881855a(21) =52209491371a(22) =156712360107a(23) =470313240999

External references