Number of digits in A068943.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =83a(6) =316a(7) =1213a(8) =4667a(9) =17992a(10) =69509a(11) =269058a(12) =1043346a(13) =4052518a(14) =15764358a(15) =61408219a(16) =239510633a(17) =935245088a(18) =3655841616a(19) =14304538696a(20) =56021145629a(21) =219579741115a(22) =861327333405