a(0) = 1; for n>0, a(n) = (n+3)*2^(n-2)-n*binomial(n-1, floor( (n-1)/2 ))-(n-1)*binomial(n-2,floor((n-2)/2)).

A121285

a(0) = 1; for n>0, a(n) = (n+3)*2^(n-2)-n*binomial(n-1, floor( (n-1)/2 ))-(n-1)*binomial(n-2,floor((n-2)/2)).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =22a(6) =54a(7) =120a(8) =284a(9) =626a(10) =1438a(11) =3136a(12) =7044a(13) =15212a(14) =33596a(15) =71952a(16) =156856a(17) =333610a(18) =719886a(19) =1522224a(20) =3257972a(21) =6855476a(22) =14574772a(23) =30541264a(24) =64571400a(25) =134827252a(26) =283727564a(27) =590608960a(28) =1237926184a(29) =2569953496

External references