Floor( 2*(2*n+1)^n*sinh(1/2) ) - (2*n+2)^n + (2*n)^n.

A127695

Floor( 2*(2*n+1)^n*sinh(1/2) ) - (2*n+2)^n + (2*n)^n.

Terms

    a(0) =1a(1) =1a(2) =6a(3) =61a(4) =933a(5) =19013a(6) =486903a(7) =15046084a(8) =545075629a(9) =22661379274

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