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 A155728 #14 Feb 09 2022 09:04:06 %S A155728 1,2,14,121,1383,19108,309708,5751027,120357325,2803145494, %T A155728 71926499002,2016492639229,61338391284387,2012321446421976, %U A155728 70833707268623448,2663117961930477847,106515148705020928105,4516063573152118802282,202328834841437929100838 %N A155728 INVERTi transform of A054765: (1, 3, 19, 160, 1744, ...). %C A155728 This sequence convolved with A054765 prefaced with a 1: (1, 1, 3, 19, 160, ...) = (1, 3, 19, 160, ...), equivalent to row sums of triangle A155729 = A054765. %F A155728 INVERTi transform of A054765 starting with offset 1: (1, 3, 19, 160, 1774, 23184, ...). %e A155728 We write (1, 3, 19, 160, ...) in reverse: (..., 19, 3, 1), top row. %e A155728 Bottom row = (1, 2, ...), so that the format for a(3) = 14 becomes: ...3, 1 = A054765: (1, 3, 19, 160, ...). ..., 1, 2 for current format, take dot product = (3*1 + 1*2) = 5, then subtract from next term in A054765, getting (19 - 5) = 14. So a(3) = 14. %e A155728 Continuing with analogous operations, we get (1, 2, 14, 121, 1383, ...). %Y A155728 Cf. A054765, A155729. %K A155728 eigen,nonn %O A155728 1,2 %A A155728 _Gary W. Adamson_ and _Alexander R. Povolotsky_, Jan 25 2009 %E A155728 Corrected by _R. J. Mathar_, Apr 04 2012 %E A155728 More terms from _Alois P. Heinz_, Mar 31 2016