Number of length n+3 0..2 arrays with at most two downsteps in every n consecutive neighbor pairs.

A255625

Number of length n+3 0..2 arrays with at most two downsteps in every n consecutive neighbor pairs.

Terms

    a(0) =81a(1) =243a(2) =729a(3) =2040a(4) =5088a(5) =11386a(6) =23298a(7) =44361a(8) =79692a(9) =136494a(10) =224676a(11) =357603a(12) =552993a(13) =833979a(14) =1230355a(15) =1780026a(16) =2530683a(17) =3541725a(18) =4886451a(19) =6654546a(20) =8954886a(21) =11918688a(22) =15703032a(23) =20494783a(24) =26514942a(25) =34023456a(26) =43324518a(27) =54772389a(28) =68777775

External references