Number of compositions of n where the difference between largest and smallest parts equals 4 and adjacent parts are unequal.
A214273
Number of compositions of n where the difference between largest and smallest parts equals 4 and adjacent parts are unequal.
Terms
- a(0) =0a(1) =2a(2) =1a(3) =8a(4) =12a(5) =23a(6) =51a(7) =90a(8) =165a(9) =295a(10) =550a(11) =952a(12) =1682a(13) =2974a(14) =5151a(15) =9007a(16) =15530a(17) =26848a(18) =46194a(19) =79404a(20) =136092a(21) =232622a(22) =397633a(23) =677892a(24) =1154741a(25) =1964078a(26) =3337218a(27) =5664428a(28) =9605090a(29) =16274305
External references
- oeis: A214273