Central terms of the triangle in A059283.

A224729

Central terms of the triangle in A059283.

Terms

    a(0) =1a(1) =2a(2) =14a(3) =138a(4) =1522a(5) =17740a(6) =213642a(7) =2628626a(8) =32833226a(9) =414697740a(10) =5282720764a(11) =67750624480a(12) =873653602902

External references