Length of list created by n substitutions k -> Range(-abs(k+1), abs(k-1)) starting with {1}.

A084077

Length of list created by n substitutions k -> Range(-abs(k+1), abs(k-1)) starting with {1}.

Terms

    a(0) =1a(1) =3a(2) =11a(3) =41a(4) =159a(5) =633a(6) =2575a(7) =10657a(8) =44735a(9) =190017a(10) =815231a(11) =3527681a(12) =15378687a(13) =67478401a(14) =297777407a(15) =1320753665a(16) =5884652543a(17) =26326301697a(18) =118211192831a(19) =532574203905

External references