Number of (3+1) X (n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.

A250880

Number of (3+1) X (n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.

Terms

    a(0) =2002a(1) =6812a(2) =16262a(3) =31928a(4) =55386a(5) =88212a(6) =131982a(7) =188272a(8) =258658a(9) =344716a(10) =448022a(11) =570152a(12) =712682a(13) =877188a(14) =1065246a(15) =1278432a(16) =1518322a(17) =1786492a(18) =2084518a(19) =2413976a(20) =2776442a(21) =3173492a(22) =3606702a(23) =4077648a(24) =4587906a(25) =5139052a(26) =5732662a(27) =6370312a(28) =7053578

External references