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

A129880

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

Terms

    a(0) =1a(1) =1a(2) =4a(3) =10a(4) =32a(5) =101a(6) =334a(7) =1129a(8) =3890a(9) =13618a(10) =48275a(11) =172995a(12) =625574a(13) =2279997a(14) =8366553a(15) =30885640a(16) =114620926a(17) =427383918a(18) =1600323161a(19) =6015226752a(20) =22687991095a(21) =85843131701a(22) =325734335544

External references