Can you solve this peculiar sum?
https://image.nostr.build/c68b432d110ab918e0c291a7b41ff99ada662480c7c74c8bc83c0f180709a55d.jpg
1 + 4(1) =5
2 + 5(2) =12
3 + 6(3) =21
8 + 11(4) =52
2 + 5(2) =12
3 + 6(3) =21
8 + 11(4) =52