Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.
A252156
Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.
Terms
- a(0) =13146a(1) =16786a(2) =35924a(3) =58792a(4) =114243a(5) =223442a(6) =446661a(7) =897932a(8) =1788360a(9) =3551084a(10) =7203948a(11) =14236172a(12) =28512252a(13) =57373724a(14) =114332028a(15) =227108060a(16) =460814748a(17) =910763612a(18) =1824282396a(19) =3671115932a(20) =7315999260a(21) =14533069724a(22) =29489106588
External references
- oeis: A252156