Number of n X 1 0..2 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

A202882

Number of n X 1 0..2 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =22a(4) =51a(5) =121a(6) =292a(7) =704a(8) =1691a(9) =4059a(10) =9749a(11) =23422a(12) =56268a(13) =135166a(14) =324692a(15) =779977a(16) =1873673a(17) =4500958a(18) =10812237a(19) =25973244a(20) =62393157a(21) =149881402a(22) =360046432a(23) =864906711a(24) =2077686532a(25) =4991036946a(26) =11989513056a(27) =28801314179a(28) =69186771332

External references