Number of paths from (0,0) to (n,n) avoiding 4 or more consecutive east steps and 4 or more consecutive north steps.

A177792

Number of paths from (0,0) to (n,n) avoiding 4 or more consecutive east steps and 4 or more consecutive north steps.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =20a(4) =62a(5) =194a(6) =616a(7) =1972a(8) =6344a(9) =20498a(10) =66486a(11) =216352a(12) =705982a(13) =2309246a(14) =7569420a(15) =24857864a(16) =81768144a(17) =269369282a(18) =888569354a(19) =2934666604a(20) =9702925752a(21) =32113058042a(22) =106379839060a(23) =352698604852

External references