main.go

package main

import "fmt"

func p(s, n, i, j int) int {
	if i == 0 || j == 0 || i == n-1 || j == n-1 {
		if i-j <= 0 {
			return s + j + i + 1
		}
		return s + 4*(n-1) - j - i + 1
	}
	return p(s+4*(n-1), n-2, i-1, j-1)
}

func f(n int) {
	for i := 0; i < n; i++ {
		for j := 0; j < n; j++ {
			fmt.Printf("%3d", p(0, n, i, j))
		}
		fmt.Printf("\n")
	}
}

func main() {
	for i := 0; i < 10; i++ {
		fmt.Printf("n = %d\n", i)
		f(i)
		fmt.Println("-----------------")
	}
}