Column 1 of matrix square of triangle A152400; also, column 3 of square array A152405.
A152404
Column 1 of matrix square of triangle A152400; also, column 3 of square array A152405.
Terms
- a(0) =1a(1) =4a(2) =22a(3) =152a(4) =1251a(5) =11869a(6) =126987a(7) =1508209a(8) =19651299a(9) =278321523a(10) =4253151796a(11) =69700149063
External references
- oeis: A152404