Number of length 5+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third.
A248438
Number of length 5+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third.
Terms
- a(0) =2a(1) =9a(2) =36a(3) =165a(4) =342a(5) =601a(6) =884a(7) =1381a(8) =1922a(9) =2533a(10) =3144a(11) =3957a(12) =4770a(13) =5613a(14) =6524a(15) =7697a(16) =8870a(17) =10149a(18) =11428a(19) =12873a(20) =14362a(21) =15857a(22) =17352a(23) =19165a(24) =21026a(25) =22893a(26) =24804a(27) =26841a(28) =28878a(29) =31061
External references
- oeis: A248438