Duplicate of A063544.A276145Duplicate of A063544.Terms a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =30a(6) =89a(7) =250a(8) =776a(9) =2236a(10) =7147a(11) =20979a(12) =68448External referencesoeis: A276145