More shit

import numpy as np
sq=np.array([[1,15,14,4],[12,6,7,9],[8,10,11,5],[13,3,2,16]])
def check():
    target=34
    print(sq.sum(axis=0),sq.sum(axis=1),np.trace(sq),np.trace(np.fliplr(sq)))
    # 2x2 sums
    sums=[]
    for i in range(3):
        for j in range(3):
            sums.append(sq[i:i+2,j:j+2].sum())
    print(sums, len(set(sums)))