Number of inseparable multisets of size n covering an initial interval of positive integers.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =3a(5) =3a(6) =8a(7) =8a(8) =20a(9) =20a(10) =48a(11) =48a(12) =112a(13) =112a(14) =256a(15) =256a(16) =576a(17) =576a(18) =1280a(19) =1280a(20) =2816a(21) =2816a(22) =6144a(23) =6144a(24) =13312a(25) =13312a(26) =28672a(27) =28672a(28) =61440a(29) =61440