Number of length 6+3 0..n arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.

A248543

Number of length 6+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) =173a(4) =594a(5) =1219a(6) =2960a(7) =6069a(8) =10858a(9) =16099a(10) =23300a(11) =33707a(12) =47400a(13) =63085a(14) =82288a(15) =106583a(16) =135878a(17) =168791a(18) =206738a(19) =250813a(20) =302416a(21) =358755a(22) =422014a(23) =498189a(24) =580572a(25) =669539a(26) =768718a(27) =878929a(28) =998028a(29) =1123317

External references