Number of (n+2)X4 0..1 matrices with each 3X3 subblock having the same population.

A224645

Number of (n+2)X4 0..1 matrices with each 3X3 subblock having the same population.

Terms

    a(0) =1280a(1) =2688a(2) =5696a(3) =12320a(4) =31232a(5) =80160a(6) =209216a(7) =587424a(8) =1660544a(9) =4729760a(10) =13842944a(11) =40629408a(12) =119599040a(13) =355446048a(14) =1057577216a(15) =3150294560a(16) =9416112512a(17) =28157621280a(18) =84241395776a(19) =252347085984a(20) =756062793344

External references