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

A249293

Number of length 3+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) =48a(1) =428a(2) =2144a(3) =9504a(4) =29100a(5) =76856a(6) =178644a(7) =374540a(8) =723300a(9) =1314744a(10) =2258528a(11) =3717444a(12) =5893024a(13) =9039940a(14) =13477788a(15) =19618656a(16) =27921268a(17) =38978528a(18) =53474096a(19) =72214004a(20) =96133160a(21) =126348344a(22) =164077052a(23) =210790324a(24) =268108160a(25) =337868944

External references