Number of triangular partitions of n of order 9.

Terms

a(0) =1a(1) =9a(2) =45a(3) =173a(4) =567a(5) =1654a(6) =4422a(7) =11040a(8) =26051a(9) =58638a(10) =126778a(11) =264670a(12) =535806a(13) =1055480a(14) =2028884a(15) =3814688a(16) =7029559a(17) =12717703a(18) =22622719a(19) =39618458a(20) =68384638a(21) =116456100a(22) =195837008a(23) =325462408a(24) =534921468a(25) =870044724a(26) =1401226327a(27) =2235733481a(28) =3535790660