DISCLAIMER: Now this really isn't a seed, this is just a Superflat Preset Code, I just chose the Seed Forum because it was the closet idea to this topic.
This Superflat Preset Code adds 1 layer of TNT (top), 1 layer of Oak Wood Planks (middle), and 1 layer of Lava (bottom). This preset is seen on ibxtoycat's YouTube Channel, but if your like me, you mainly play on PC, and It's impossible to customize the Material Type in the Superflat Customize Menu. You could just search up a TNT Superflat Survival Preset, but I already did that, and it was hard to find a specific one. You could create one yourself, but again... It's kinda hard. So that's why I created this Superflat Preset! I created it using a easy Superflat Preset Generator (link to generator is at the bottom of this thread).