a(n) = T(n,n), T given by A026552. Also a(n) is the number of integer strings s(0),...,s(n) counted by T, such that s(n)=0.
A026553
a(n) = T(n,n), T given by A026552. Also a(n) is the 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) =4a(4) =12a(5) =20a(6) =58a(7) =104a(8) =300a(9) =556a(10) =1608a(11) =3032a(12) =8806a(13) =16778a(14) =48924a(15) =93872a(16) =274644a(17) =529684a(18) =1553940a(19) =3008864a(20) =8846772a(21) =17184188a(22) =50618184a(23) =98577712a(24) =290817566a(25) =567591142a(26) =1676640462a(27) =3278348608a(28) =9694857750a(29) =18986482250
External references
- oeis: A026553