Number of ways to quarter a 2n X 2n chessboard.

A257952

Number of ways to quarter a 2n X 2n chessboard.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =37a(4) =766a(5) =43318a(6) =7695805a(7) =4015896016

External references