Triangle T(n,k) = coefficient of x^n*y^k/(n!*k!) in 1/(1-x-y-x*y), read by rows in order 00, 10, 01, 20, 11, 02, ...
A059446
Triangle T(n,k) = coefficient of x^n*y^k/(n!*k!) in 1/(1-x-y-x*y), read by rows in order 00, 10, 01, 20, 11, 02, ...
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =2a(6) =6a(7) =10a(8) =10a(9) =6a(10) =24a(11) =42a(12) =52a(13) =42a(14) =24a(15) =120a(16) =216a(17) =300a(18) =300a(19) =216a(20) =120a(21) =720a(22) =1320a(23) =1968a(24) =2268a(25) =1968a(26) =1320a(27) =720a(28) =5040a(29) =9360
External references
- oeis: A059446