Number of (n+2)X(3+2) 0..1 arrays x(i,j) with every row sum{j*x(i,j), j=1..3+2} equal, and every column sum{i*x(i,j), i=1..n+2} equal, with upper left element zero.
A232649
Number of (n+2)X(3+2) 0..1 arrays x(i,j) with every row sum{j*x(i,j), j=1..3+2} equal, and every column sum{i*x(i,j), i=1..n+2} equal, with upper left element zero.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =7a(4) =1a(5) =19a(6) =55a(7) =1a(8) =259a(9) =613a(10) =1a(11) =3571a(12) =8881a(13) =1a(14) =55765a(15) =142369a(16) =1a(17) =947947a(18) =2468845a(19) =1a(20) =17099809a(21) =45375499a(22) =1a(23) =323927185a(24) =871038571a(25) =1a(26) =6369199909a(27) =17312303761a(28) =1a(29) =129094833121
External references
- oeis: A232649