a(n) = T(n, n-2), T given by A026584. Also a(n) = number of integer strings s(0),...,s(n) counted by T, such that s(n)=2.
A026587
a(n) = T(n, n-2), T given by A026584. Also a(n) = number of integer strings s(0),...,s(n) counted by T, such that s(n)=2.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =9a(4) =28a(5) =62a(6) =167a(7) =399a(8) =1024a(9) =2518a(10) =6359a(11) =15819a(12) =39759a(13) =99427a(14) =249699a(15) =626203a(16) =1573524a(17) =3953446a(18) =9943905a(19) =25019005a(20) =62994733a(21) =158680545a(22) =399936573a(23) =1008438757a(24) =2543992514a(25) =6420413940a(26) =16210331727a(27) =40943722115a(28) =103453402718
External references
- oeis: A026587