A sequence generated from a semi-magic square.

Terms

a(0) =1a(1) =13a(2) =72a(3) =429a(4) =2601a(5) =15534a(6) =93339a(7) =559845a(8) =3359232a(9) =20155473a(10) =120932109a(11) =725594598a(12) =4353563943a(13) =26121388761a(14) =156728328192a(15) =940369966965