Let M be the matrix defined in A111490. Sequence gives the sum of the elements of the submatrices (from the upper left element): M(1,1); M(1,1)+M(1,2)+M(1,2)+M(2,2); M(1,1)+M(1,2)+M(1,3)+M(2,1)+M(2,2)+M(2,3)+M(3,1)+M(3,2)+M(3,3), etc.
A123326
Let M be the matrix defined in A111490. Sequence gives the sum of the elements of the submatrices (from the upper left element): M(1,1); M(1,1)+M(1,2)+M(1,2)+M(2,2); M(1,1)+M(1,2)+M(1,3)+M(2,1)+M(2,2)+M(2,3)+M(3,1)+M(3,2)+M(3,3), etc.
Terms
- a(0) =1a(1) =5a(2) =13a(3) =27a(4) =47a(5) =77a(6) =114a(7) =165a(8) =226a(9) =302a(10) =391a(11) =502a(12) =622a(13) =768a(14) =933a(15) =1120a(16) =1325a(17) =1564a(18) =1819a(19) =2112a(20) =2424a(21) =2768a(22) =3143a(23) =3564a(24) =3998a(25) =4477a(26) =4993a(27) =5551a(28) =6138a(29) =6783
External references
- oeis: A123326