Number of (n+2)X4 0..2 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

A185470

Number of (n+2)X4 0..2 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

Terms

    a(0) =4594a(1) =21834a(2) =76309a(3) =225672a(4) =594798a(5) =1433903a(6) =3212372a(7) =6763143a(8) =13496424a(9) =25706057a(10) =46997040a(11) =82868632a(12) =141494158a(13) =234746166a(14) =379524035a(15) =599450565a(16) =927014574a(17) =1406248164a(18) =2096040183a(19) =3074201592a(20) =4442414038a(21) =6332210033

External references