Number of structures of size n in class A = o x (o + MSET(A)) where o is a neutral structure of size 1.

A237585

Number of structures of size n in class A = o x (o + MSET(A)) where o is a neutral structure of size 1.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =3a(4) =6a(5) =15a(6) =36a(7) =94a(8) =245a(9) =663a(10) =1815a(11) =5062a(12) =14269a(13) =40706a(14) =117103a(15) =339673a(16) =991834a(17) =2913869a(18) =8605576a(19) =25536300a(20) =76096896a(21) =227634717a(22) =683296679a(23) =2057540487a(24) =6213495745a(25) =18813535942a(26) =57103173296a(27) =173710272584a(28) =529534793886

External references