a(n) = T(n,n-1), T given by A026552. Also a(n) is the number of integer strings s(0),...,s(n) counted by T, such that s(n)=1.

A026554

a(n) = T(n,n-1), T given by A026552. Also a(n) is the number of integer strings s(0),...,s(n) counted by T, such that s(n)=1.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =10a(4) =19a(5) =52a(6) =98a(7) =278a(8) =526a(9) =1516a(10) =2887a(11) =8389a(12) =16073a(13) =46936a(14) =90386a(15) =264842a(16) =512128a(17) =1504432a(18) =2918954a(19) =8592094a(20) =16716998a(21) =49288856a(22) =96119927a(23) =283795571a(24) =554524660a(25) =1639174304a(26) =3208254571a(27) =9493241125a(28) =18607536319a(29) =55108565584

External references