Duplicate of A045925.

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =12a(5) =25a(6) =48a(7) =91a(8) =168a(9) =306a(10) =550a(11) =979a(12) =1728a(13) =3029a(14) =5278a(15) =9150a(16) =15792a(17) =27149a(18) =46512a(19) =79439a(20) =135300a(21) =229866a(22) =389642a(23) =659111a(24) =1112832