a(n)=a(n-1)*(2^K)+ n*(n+1)/2 ; a(0)=1; K=floor(log_2 n*(n+1)/2).
A136310
a(n)=a(n-1)*(2^K)+ n*(n+1)/2 ; a(0)=1; K=floor(log_2 n*(n+1)/2).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =34a(4) =282a(5) =2271a(6) =36357a(7) =581740a(8) =18615716a(9) =595702957a(10) =19062494679
External references
- oeis: A136310