This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A159747 #12 Feb 04 2021 10:57:18 %S A159747 89,504,1490,3525,7617,15808,32192,64960,130496,261568,523712,1048000, %T A159747 2096576,4193728,8388032,16776640,33553856,67108288,134217152, %U A159747 268434880,536870336,1073741248,2147483072,4294966720,8589934016,17179868608,34359737792,68719476160,137438952896 %N A159747 If 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 10. See A159741 for details. %F A159747 Interpolate a(n)=(-2*n^4+22*n^3-107.5*n^2+276.5*n+1245)/3 offset 0 & b(n)=(2*n^4-18*n^3+77.5*n^2-184.5*n+1713)/3 offset 0. Add a leading 89. Binomially transform. [From Al Hakanson (hawkuu(AT)gmail.com), Jun 08 2009] %F A159747 a(n) = T(n+9,n+1) with T defined in A159741. a(n) = 2^(n+8)-576 for n>=6. - _R. J. Mathar_, Feb 04 2021 %K A159747 nonn,easy %O A159747 1,1 %A A159747 Al Hakanson (hawkuu(AT)gmail.com), Apr 20 2009 %E A159747 a(8) and beyond by _R. J. Mathar_, Feb 04 2021