Column 0 of triangle A113988, which is the matrix square of A113983: a(n) = [A113983^2](n,0).
A113989
Column 0 of triangle A113988, which is the matrix square of A113983: a(n) = [A113983^2](n,0).
Terms
- a(0) =1a(1) =2a(2) =4a(3) =8a(4) =18a(5) =46a(6) =136a(7) =464a(8) =1818a(9) =8122a(10) =41076a(11) =233472a(12) =1480946a(13) =10412590a(14) =80634432a(15) =683674832a(16) =6312152354a(17) =63144706754a(18) =681317547508
External references
- oeis: A113989