Number of (n+1) X (5+1) 0..3 arrays with every 2 X 2 subblock summing to 6 and no 2 X 2 subblock having exactly two nonzero entries.

A251233

Number of (n+1) X (5+1) 0..3 arrays with every 2 X 2 subblock summing to 6 and no 2 X 2 subblock having exactly two nonzero entries.

Terms

    a(0) =2930a(1) =5194a(2) =9914a(3) =20490a(4) =44966a(5) =103926a(6) =250622a(7) =626122a(8) =1610186a(9) =4240330a(10) =11386550a(11) =31076502a(12) =85989998a(13) =240797850a(14) =681516362a(15) =1947640474a(16) =5616316454a(17) =16333536118a(18) =47886799742a(19) =141482904522a(20) =421114402730

External references