Number of 0..n arrays x(0..3) of 4 elements without any interior element greater than both neighbors.

A200887

Number of 0..n arrays x(0..3) of 4 elements without any interior element greater than both neighbors.

Terms

    a(0) =12a(1) =51a(2) =144a(3) =325a(4) =636a(5) =1127a(6) =1856a(7) =2889a(8) =4300a(9) =6171a(10) =8592a(11) =11661a(12) =15484a(13) =20175a(14) =25856a(15) =32657a(16) =40716a(17) =50179a(18) =61200a(19) =73941a(20) =88572a(21) =105271a(22) =124224a(23) =145625a(24) =169676a(25) =196587a(26) =226576a(27) =259869a(28) =296700a(29) =337311

External references