1048464domain: NAppears in sequencesIf an array is made of columns of -nacci sequences, fibo-, tribo- etc. all starting w. 1,1,2 etc, the NW to SE diagonals can be extended by computation. The above is diagonal 8. See A159741 for details.at n=13A159744Fibonacci 15-step numbers, a(n) = a(n-1) + a(n-2) + ... + a(n-15).at n=21A220493