Number of length 3+3 0..n arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.

A248540

Number of length 3+3 0..n arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.

Terms

    a(0) =2a(1) =15a(2) =52a(3) =125a(4) =306a(5) =555a(6) =992a(7) =1673a(8) =2606a(9) =3663a(10) =5024a(11) =6777a(12) =8914a(13) =11379a(14) =14264a(15) =17729a(16) =21738a(17) =26191a(18) =31204a(19) =36933a(20) =43322a(21) =50243a(22) =57892a(23) =66645a(24) =76034a(25) =86163a(26) =97156a(27) =109293a(28) =122350a(29) =136083

External references