a(n) = a(n-1) + n*(n+1)*a(n-2) with a(0)=1, a(1)=1.

A346943

a(n) = a(n-1) + n*(n+1)*a(n-2) with a(0)=1, a(1)=1.

Terms

    a(0) =1a(1) =1a(2) =7a(3) =19a(4) =159a(5) =729a(6) =7407a(7) =48231a(8) =581535a(9) =4922325a(10) =68891175a(11) =718638075a(12) =11465661375a(13) =142257791025

External references