a(n) = T(n,n), T given by A026568. Also a(n) = number of integer strings s(0),...,s(n) counted by T, such that s(n)=0.

A026569

a(n) = T(n,n), T given by A026568. Also a(n) = number of integer strings s(0),...,s(n) counted by T, such that s(n)=0.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =5a(4) =13a(5) =27a(6) =67a(7) =153a(8) =375a(9) =893a(10) =2189a(11) =5319a(12) =13089a(13) =32155a(14) =79479a(15) =196573a(16) =487833a(17) =1212135a(18) =3018355a(19) =7525585a(20) =18792303a(21) =46980373a(22) =117589689a(23) =294613155a(24) =738844719a(25) =1854484305a(26) =4658460165a(27) =11710592711a(28) =29458662005a(29) =74151824271

External references