Number of length 7+2 0..n arrays with no three consecutive terms having the sum of any two elements equal to twice the third.
A248468
Number of length 7+2 0..n arrays with no three consecutive terms having the sum of any two elements equal to twice the third.
Terms
- a(0) =110a(1) =1152a(2) =43940a(3) =387488a(4) =2582406a(5) =11447368a(6) =44452660a(7) =139623544a(8) =400150926a(9) =1002628764a(10) =2352502608a(11) =5078891508a(12) =10430306882a(13) =20141675148a(14) =37480145240a(15) =66683720948a(16) =115148012058a(17) =192026426768a(18) =312626222120a(19) =495163608752
External references
- oeis: A248468