The (1,1)-entry in the matrix M^n, where M is the 7 X 7 Cartan matrix [2,-1,0,0,0,0,0; -1,2,-1,0,0,0,0; 0,-1,2,-1,0,0,-1; 0,0,-1,2,-1,0,0; 0,0,0,-1,2,-1,0; 0,0,0,0,-1,2,0; 0,0,-1,0,0,0,2].
A125501
The (1,1)-entry in the matrix M^n, where M is the 7 X 7 Cartan matrix [2,-1,0,0,0,0,0; -1,2,-1,0,0,0,0; 0,-1,2,-1,0,0,-1; 0,0,-1,2,-1,0,0; 0,0,0,-1,2,-1,0; 0,0,0,0,-1,2,0; 0,0,-1,0,0,0,2].
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =42a(5) =132a(6) =430a(7) =1444a(8) =4981a(9) =17594a(10) =63442a(11) =232828a(12) =867145a(13) =3269034a(14) =12446307a(15) =47767466a(16) =184508963a(17) =716386598a(18) =2793067210a(19) =10926148172a(20) =42857189054a(21) =168471757292a(22) =663434825367
External references
- oeis: A125501