Number of (n+1) X 4 binary arrays with rows and columns in nondecreasing order and with no 2 X 2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.

A184065

Number of (n+1) X 4 binary arrays with rows and columns in nondecreasing order and with no 2 X 2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.

Terms

    a(0) =20a(1) =36a(2) =130a(3) =382a(4) =924a(5) =1884a(6) =3463a(7) =5800a(8) =9065a(9) =13397a(10) =18940a(11) =25837a(12) =34232a(13) =44269a(14) =56092a(15) =69845a(16) =85672a(17) =103717a(18) =124124a(19) =147037a(20) =172600a(21) =200957a(22) =232252a(23) =266629a(24) =304232a(25) =345205a(26) =389692a(27) =437837a(28) =489784a(29) =545677

External references