Hilltop maps: number of n X 1 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..4 n X 1 array.
A218281
Hilltop maps: number of n X 1 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..4 n X 1 array.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =15a(4) =31a(5) =61a(6) =121a(7) =241a(8) =481a(9) =961a(10) =1921a(11) =3839a(12) =7671a(13) =15327a(14) =30623a(15) =61185a(16) =122249a(17) =244257a(18) =488033a(19) =975105a(20) =1948289a(21) =3892739a(22) =7777807a(23) =15540287a(24) =31049951a(25) =62038717a(26) =123955185a(27) =247666113a(28) =494844193a(29) =988713281
External references
- oeis: A218281