Integer sequences, such as Fibonacci, Lucas, Jacobsthal, Jacobsthal Lucas,
Pell charm us with their abundant applications in science and art, and very
interesting properties. For instance, it is well known that computers use conditional
directives to change the flow of execution of a program. In addition to
branch instructions, some microcontrollers use skip instructions which conditionally
bypass the next instruction.This brings out being useful for one case
out of the four possibilities on 2 bits, 3 cases on 3 bits, 5 cases on 4 bits,
11 cases on 5 bits, 21 cases on 6 bits,..., which are exactly the Jacobsthal numbers.