Number of (n+1) X 2 0..2 arrays with the permanents of all 2 X 2 subblocks equal and nonzero.

A204833

Number of (n+1) X 2 0..2 arrays with the permanents of all 2 X 2 subblocks equal and nonzero.

Terms

    a(0) =56a(1) =132a(2) =318a(3) =804a(4) =2048a(5) =5304a(6) =13786a(7) =36074a(8) =94630a(9) =249116a(10) =657120a(11) =1737412a(12) =4601434a(13) =12208078a(14) =32435606a(15) =86299392a(16) =229889712a(17) =613103960a(18) =1636797162a(19) =4373968322a(20) =11698648166a(21) =31314844564a(22) =83885825808a(23) =224868555948

External references