Column 1 of triangle A152400; also, column 1 of square array A152405.
A152401
Column 1 of triangle A152400; also, column 1 of square array A152405.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =45a(4) =318a(5) =2671a(6) =25805a(7) =280609a(8) =3381993a(9) =44658052a(10) =640279918a(11) =9895457035a(12) =163871617543
External references
- oeis: A152401