package main

import "fmt"

func main() {
    const max = 1000
    a := make([]int, max) // all zero by default
    for n := 0; n < max-1; n++ {
        for m := n - 1;  m >= 0; m-- {
            if a[m] == a[n] {
                a[n+1] = n - m
                break
            }
        }
    }
    fmt.Println("The first ten terms of the Van Eck sequence are:")
    fmt.Println(a[:10])
    fmt.Println("\nTerms 991 to 1000 of the sequence are:")
    fmt.Println(a[990:])
}