Number of length 6+3 0..n arrays with no four consecutive terms having the sum of any three elements equal to three times the fourth.

A249296

Number of length 6+3 0..n arrays with no four consecutive terms having the sum of any three elements equal to three times the fourth.

Terms

    a(0) =298a(1) =7132a(2) =73204a(3) =740616a(4) =3996816a(5) =17477172a(6) =63142432a(7) =194636612a(8) =528526458a(9) =1310146892a(10) =2974170600a(11) =6332136700a(12) =12731677772a(13) =24341338640a(14) =44558190142a(15) =78679898026a(16) =134198692616a(17) =222298159666a(18) =358597980904a(19) =564781557470

External references