Length of list created by n substitutions k -> Range[-abs(k+1), abs(k-1), 2] starting with {0}.
A084078
Length of list created by n substitutions k -> Range[-abs(k+1), abs(k-1), 2] starting with {0}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =24a(5) =66a(6) =172a(7) =498a(8) =1360a(9) =4066a(10) =11444a(11) =34970a(12) =100520a(13) =312066a(14) =911068a(15) =2862562a(16) =8457504a(17) =26824386a(18) =80006116a(19) =255680170a(20) =768464312a(21) =2471150402a(22) =7474561164a(23) =24161357010a(24) =73473471344a(25) =238552980386a(26) =728745517972
External references
- oeis: A084078