Number of doublerises in all bargraphs having semiperimeter n (n>=2). A doublerise in a bargraph is any pair of adjacent up steps.
A273714
Number of doublerises in all bargraphs having semiperimeter n (n>=2). A doublerise in a bargraph is any pair of adjacent up steps.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =14a(4) =47a(5) =155a(6) =508a(7) =1662a(8) =5438a(9) =17809a(10) =58395a(11) =191732a(12) =630373a(13) =2075221a(14) =6840140a(15) =22571800a(16) =74564874a(17) =246568051a(18) =816099650a(19) =2703492238a(20) =8963064935a(21) =29738123605a(22) =98735734915a(23) =328034119098
External references
- oeis: A273714