Number of length n+2 0..7 arrays with every three consecutive terms having the sum of some two elements equal to twice the third.
A248432
Number of length n+2 0..7 arrays with every three consecutive terms having the sum of some two elements equal to twice the third.
Terms
- a(0) =80a(1) =140a(2) =252a(3) =462a(4) =884a(5) =1684a(6) =3200a(7) =6216a(8) =11944a(9) =22810a(10) =44396a(11) =85402a(12) =163204a(13) =317716a(14) =611248a(15) =1168198a(16) =2274196a(17) =4375320a(18) =8362052a(19) =16278784a(20) =31318664a(21) =59855842a(22) =116523764a(23) =224179214a(24) =428448488a(25) =834077068a(26) =1604674164a(27) =3066832822
External references
- oeis: A248432