What is this value? online puzzle

4x4 - 16 pieces5x5 - 25 pieces6x6 - 36 pieces7x7 - 49 pieces8x8 - 64 pieces9x9 - 81 pieces10x10 - 100 pieces11x11 - 121 pieces12x12 - 144 pieces13x13 - 169 pieces14x14 - 196 pieces15x15 - 225 pieces16x16 - 256 pieces17x17 - 289 pieces18x18 - 324 pieces19x19 - 361 pieces20x20 - 400 pieces Start a new game Create a multiplayer game table

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16

8