Triangle, read by rows, where T(n,k) = n*T(n-1,k-1) + T(n-1,k-2) for n>0 and k>1, with T(n,0) = T(n-1,n-1) and T(n,1) = n*T(n-1,0) for n>0 and T(0,0) = 1.
A132005
Triangle, read by rows, where T(n,k) = n*T(n-1,k-1) + T(n-1,k-2) for n>0 and k>1, with T(n,0) = T(n-1,n-1) and T(n,1) = n*T(n-1,0) for n>0 and T(0,0) = 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =3a(7) =3a(8) =7a(9) =11a(10) =11a(11) =12a(12) =15a(13) =31a(14) =51a(15) =51a(16) =55a(17) =71a(18) =87a(19) =170a(20) =286a(21) =286a(22) =306a(23) =381a(24) =481a(25) =593a(26) =1107a(27) =1886a(28) =1886a(29) =2002
External references
- oeis: A132005