Number of perfect matchings in the twisted graph (C_4 X C_n)_(1234).

A220867

Number of perfect matchings in the twisted graph (C_4 X C_n)_(1234).

Terms

    a(0) =2a(1) =14a(2) =80a(3) =194a(4) =888a(5) =2702a(6) =11040a(7) =37634a(8) =146024a(9) =524174a(10) =1988720a(11) =7300802a(12) =27436248a(13) =101687054a(14) =380604480a(15) =1416317954a(16) =5292200648a(17) =19726764302a(18) =73658763920a(19) =274758382274

External references