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

A276123

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

Terms

    a(0) =1a(1) =1a(2) =1a(3) =4a(4) =10a(5) =55a(6) =154a(7) =868a(8) =2449a(9) =13825a(10) =39025a(11) =220324a(12) =621946a(13) =3511351a(14) =9912106a(15) =55961284a(16) =157971745a(17) =891869185a(18) =2517635809a(19) =14213945668a(20) =40124201194a(21) =226531261495a(22) =639469583290

External references