The number of peaks of width 1 (i.e., UHD configurations, where U = (0,1), H=(1,0), D=(0,-1)) in all bargraphs of semiperimeter n (n>=2).

A273716

The number of peaks of width 1 (i.e., UHD configurations, where U = (0,1), H=(1,0), D=(0,-1)) in all bargraphs of semiperimeter n (n>=2).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =8a(4) =23a(5) =69a(6) =212a(7) =662a(8) =2091a(9) =6661a(10) =21359a(11) =68850a(12) =222892a(13) =724175a(14) =2360010a(15) =7711148a(16) =25252819a(17) =82863807a(18) =272385447a(19) =896774552a(20) =2956599075a(21) =9760032991a(22) =32255829642a(23) =106713308118a(24) =353381245728

External references