a(1) = 1, a(2) = 2, a(3) = 2, a(4) = 3, for n >= 3, a(n+2) = a(n+1) + a(n)*floor(n/2)*ceiling(n/2).

A098738

a(1) = 1, a(2) = 2, a(3) = 2, a(4) = 3, for n >= 3, a(n+2) = a(n+1) + a(n)*floor(n/2)*ceiling(n/2).

Terms

    a(0) =1a(1) =2a(2) =2a(3) =3a(4) =7a(5) =19a(6) =61a(7) =232a(8) =964a(9) =4676a(10) =23956a(11) =140856a(12) =859536a(13) =5930352a(14) =42030864a(15) =332618112a(16) =2686346496a(17) =23973905664a(18) =217390853376

External references