Sum of all matrix elements of n X n matrix M(i,j) = Fibonacci(i+j-1).

Terms

a(0) =1a(1) =5a(2) =20a(3) =65a(4) =193a(5) =544a(6) =1489a(7) =4005a(8) =10660a(9) =28193a(10) =74273a(11) =195200a(12) =512257a(13) =1343077a(14) =3519412a(15) =9219105a(16) =24144289a(17) =63224096a(18) =165544721a(19) =433437125a(20) =1134810436a(21) =2971065025a(22) =7778499265a(23) =20364618240a(24) =53315655553a(25) =139582833989a(26) =365433632084a(27) =956719333505