Number of length n+3 0..3 arrays with no pair in any consecutive four terms totalling exactly 3.

A246474

Number of length n+3 0..3 arrays with no pair in any consecutive four terms totalling exactly 3.

Terms

    a(0) =60a(1) =132a(2) =292a(3) =644a(4) =1420a(5) =3132a(6) =6908a(7) =15236a(8) =33604a(9) =74116a(10) =163468a(11) =360540a(12) =795196a(13) =1753860a(14) =3868260a(15) =8531716a(16) =18817292a(17) =41502844a(18) =91537404a(19) =201892100a(20) =445287044a(21) =982111492a(22) =2166115084a(23) =4777517212a(24) =10537145916a(25) =23240406916a(26) =51258331044

External references