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 A353593 #9 Apr 29 2022 03:00:02 %S A353593 1,1,1,2,3,1,4,8,5,1,8,20,18,7,1,15,47,56,32,9,1,29,107,158,120,50,11, %T A353593 1,56,238,419,397,220,72,13,1,108,520,1063,1207,836,364,98,15,1,208, %U A353593 1120,2608,3452,2871,1563,560,128,17,1,401,2386,6233,9424,9153,5987,2682,816,162,19,1 %N A353593 Triangle read by rows. The Riordan square of the tetranacci numbers (A000078). %C A353593 See A321620 for the definition of the Riordan square. %e A353593 Triangle starts: %e A353593 [0] 1; %e A353593 [1] 1, 1; %e A353593 [2] 2, 3, 1; %e A353593 [3] 4, 8, 5, 1; %e A353593 [4] 8, 20, 18, 7, 1; %e A353593 [5] 15, 47, 56, 32, 9, 1; %e A353593 [6] 29, 107, 158, 120, 50, 11, 1; %e A353593 [7] 56, 238, 419, 397, 220, 72, 13, 1; %e A353593 [8] 108, 520, 1063, 1207, 836, 364, 98, 15, 1; %e A353593 [9] 208, 1120, 2608, 3452, 2871, 1563, 560, 128, 17, 1. %p A353593 # The function RiordanSquare is defined in A321620. %p A353593 RiordanSquare(1/(1 - x - x^2 - x^3 - x^4), 10); %Y A353593 Cf. A000078 (tetranacci), A160175 (row sums), A321620 (Riordan square). %K A353593 nonn,tabl %O A353593 0,4 %A A353593 _Peter Luschny_, Apr 29 2022