Solid partitions of n which are restricted to two planes.

Terms

a(0) =1a(1) =1a(2) =4a(3) =9a(4) =22a(5) =46a(6) =102a(7) =206a(8) =427a(9) =841a(10) =1658a(11) =3173a(12) =6038a(13) =11251a(14) =20807a(15) =37907a(16) =68493a(17) =122338a(18) =216819a(19) =380637a(20) =663417a(21) =1147033a(22) =1969961a(23) =3359677a(24) =5694592a(25) =9592063a(26) =16065593a(27) =26756430a(28) =44328414a(29) =73063013