T(n,k)=1/4 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences.

A209858

T(n,k)=1/4 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences.

Terms

    a(0) =25a(1) =182a(2) =182a(3) =1308a(4) =2829a(5) =1308a(6) =9455a(7) =43091a(8) =43091a(9) =9455a(10) =68201a(11) =661963a(12) =1386131a(13) =661963a(14) =68201a(15) =492373a(16) =10137464a(17) =45071990a(18) =45071990a(19) =10137464a(20) =492373a(21) =3553425a(22) =155490654a(23) =1460712837a(24) =3111914707a(25) =1460712837a(26) =155490654a(27) =3553425a(28) =25648639

External references