Number of pyramids which can be constructed using n 1 x 2 tiles placed on an integral grid, with the base block at a fixed position.

A139397

Number of pyramids which can be constructed using n 1 x 2 tiles placed on an integral grid, with the base block at a fixed position.

Terms

    a(0) =1a(1) =7a(2) =58a(3) =521a(4) =4906a(5) =47644a(6) =472844a(7) =4768953a(8) =48699382a(9) =502239812a(10) =5221405608a(11) =54645915476a(12) =575131754640

External references