n^2 * a(n) = 2*(17*n^2-21*n+9) * a(n-1) - 4*(112*n^2-280*n+197) * a(n-2) + 40*(68*n^2-256*n+251) * a(n-3) - 1600*(2*n-5)^2 * a(n-4), with a(0)=1, a(1)=10, a(2)=90, a(3)=780.
A276020
n^2 * a(n) = 2*(17*n^2-21*n+9) * a(n-1) - 4*(112*n^2-280*n+197) * a(n-2) + 40*(68*n^2-256*n+251) * a(n-3) - 1600*(2*n-5)^2 * a(n-4), with a(0)=1, a(1)=10, a(2)=90, a(3)=780.
Terms
- a(0) =1a(1) =10a(2) =90a(3) =780a(4) =6630a(5) =55820a(6) =469220a(7) =3967000a(8) =33951750a(9) =295553500a(10) =2622492940a(11) =23701797800a(12) =217528135900
External references
- oeis: A276020