a(n) is the number of ternary strings of length n with at least one 0, at least two 1's and at least three 2's.

A385312

a(n) is the number of ternary strings of length n with at least one 0, at least two 1's and at least three 2's.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =60a(7) =455a(8) =2268a(9) =9366a(10) =34800a(11) =121077a(12) =403392a(13) =1304732a(14) =4133220a(15) =12900771a(16) =39837684a(17) =122064930a(18) =371891592a(19) =1128317489a(20) =3412864056a(21) =10299925992a(22) =31033986588a(23) =93394501983a(24) =280818931020a(25) =843832511150

External references