Probable extension of A013704.

Terms

a(0) =1a(1) =2a(2) =12a(3) =44a(4) =100a(5) =203a(6) =344a(7) =558a(8) =824a(9) =1189a(10) =1620a(11) =2176a(12) =2812a(13) =3599a(14) =4480a(15) =5538a(16) =6704a(17) =8073a(18) =9564a(19) =11284a(20) =13140a(21) =15251a(22) =17512a(23) =20054a(24) =22760a(25) =25773a(26) =28964a(27) =32488a(28) =36204a(29) =40279