a(n) = floor( sum(k=0, infinity, k^n/(k!)^2 ) ); related to generalized Bell numbers.

A086880

a(n) = floor( sum(k=0, infinity, k^n/(k!)^2 ) ); related to generalized Bell numbers.

Terms

    a(0) =2a(1) =1a(2) =2a(3) =3a(4) =7a(5) =17a(6) =45a(7) =128a(8) =391a(9) =1287a(10) =4524a(11) =16889a(12) =66657a(13) =276982a(14) =1207598a(15) =5507362a(16) =26203307a(17) =129757596a(18) =667358910a(19) =3558097578a(20) =19632277761a(21) =111930731957a(22) =658482495614

External references