Sequence t_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition).

A129875

Sequence t_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition).

Terms

    a(0) =0a(1) =2a(2) =4a(3) =9a(4) =22a(5) =45a(6) =120a(7) =239a(8) =670a(9) =1320a(10) =3824a(11) =7494a(12) =22224a(13) =43428a(14) =131076a(15) =255711a(16) =782494a(17) =1525014a(18) =4718676a(19) =9190677a(20) =28698678a(21) =55876161a(22) =175821684a(23) =342247020a(24) =1083990696a(25) =2109783728a(26) =6720103072a(27) =13078616688a(28) =41863938704a(29) =81473918808

External references