https://www.google.com/search?q=inte...FYWbiAodsSIH2A
I googled interlocking squares and came up with the above. I think one of the manufactures had the pattern on their website last year. It might have been in one of the 100 block magazines, also. You can right click picture and do a google search to see if the image comes up with any information. It is out there as I remember seeing it months ago. Good luck.