Number of (n+2) X (3+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 3 6 or 7.

A252109

Number of (n+2) X (3+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 3 6 or 7.

Terms

    a(0) =1568a(1) =724a(2) =554a(3) =776a(4) =1258a(5) =1634a(6) =2476a(7) =3938a(8) =5956a(9) =9176a(10) =14532a(11) =22664a(12) =35248a(13) =55688a(14) =88336a(15) =138080a(16) =217872a(17) =348704a(18) =546496a(19) =861728a(20) =1385536a(21) =2174336a(22) =3427392a(23) =5523584a(24) =8674048a(25) =13670528a(26) =22057216a(27) =34649600a(28) =54604032a(29) =88154624

External references