Number of n X 2 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2 and rows and columns in nondecreasing order.

A183409

Number of n X 2 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2 and rows and columns in nondecreasing order.

Terms

    a(0) =2a(1) =5a(2) =8a(3) =15a(4) =21a(5) =34a(6) =44a(7) =65a(8) =80a(9) =111a(10) =132a(11) =175a(12) =203a(13) =260a(14) =296a(15) =369a(16) =414a(17) =505a(18) =560a(19) =671a(20) =737a(21) =870a(22) =948a(23) =1105a(24) =1196a(25) =1379a(26) =1484a(27) =1695a(28) =1815a(29) =2056

External references