Sequence i_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition).
A129876
Sequence i_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition).
Terms
- a(0) =2a(1) =4a(2) =14a(3) =52a(4) =210a(5) =888a(6) =3886a(7) =17448a(8) =79922a(9) =372012a(10) =1754526a(11) =8366316a(12) =40267426a(13) =195365104a(14) =954454750a(15) =4691436944a(16) =23184133474a(17) =115120702740a(18) =574085981614
External references
- oeis: A129876