Number of (n+1)X(3+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal.

A233404

Number of (n+1)X(3+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal.

Terms

    a(0) =22a(1) =35a(2) =211a(3) =360a(4) =1461a(5) =2543a(6) =8732a(7) =15431a(8) =46953a(9) =84143a(10) =236070a(11) =431533a(12) =1139832a(13) =2108530a(14) =5322489a(15) =9995589a(16) =24398272a(17) =46169416a(18) =109661296a(19) =209717615a(20) =488266741a(21) =937818172a(22) =2145733905a(23) =4151538574a(24) =9381737335a(25) =18189661542a(26) =40631596581

External references