a(0) = 0, a(1) = 1, and a(n) = ((2*n - 1)*a(n-1) + 3*n*a(n-2))/(n - 1) for n >= 2.
A102839
a(0) = 0, a(1) = 1, and a(n) = ((2*n - 1)*a(n-1) + 3*n*a(n-2))/(n - 1) for n >= 2.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =12a(4) =40a(5) =135a(6) =441a(7) =1428a(8) =4572a(9) =14535a(10) =45925a(11) =144408a(12) =452244a(13) =1411501a(14) =4392675a(15) =13636080a(16) =42237792a(17) =130580451a(18) =403009209a(19) =1241912580a(20) =3821849640a(21) =11746816389a(22) =36064532427a(23) =110610649548a(24) =338928124500
External references
- oeis: A102839