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 A178441 #16 Feb 20 2025 12:53:12 %S A178441 1,2,7,17,46,119,311,812,2118,5530,14431,37668,98313,256602,669742, %T A178441 1748052,4562490,11908280,31081099,81122927,211734137,552634698, %U A178441 1442399007,3764720003,9826072122,25646447377 %N A178441 INVERT transform of A058187, the tetrahedral numbers with repeats. %H A178441 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (2,3,-3,-3,3,1,-1). %F A178441 G.f.: 1/ ( 1-2*x-3*x^2+3*x^3+3*x^4-3*x^5-x^6+x^7 ). - _R. J. Mathar_, Apr 04 2012 %e A178441 a(4) = 46 = (10, 4, 4, 1, 1) dot (1, 1, 2, 7, 17) = (10 + 4 + 8 + 7 + 17). %Y A178441 Cf. A058187. %K A178441 nonn %O A178441 0,2 %A A178441 _Gary W. Adamson_, Dec 22 2010 %E A178441 Corrected by _R. J. Mathar_, Apr 04 2012