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Triangle read by rows. The Riordan square of the tetranacci numbers (A000078).
1

%I #9 Apr 29 2022 03:00:02

%S 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 1,56,238,419,397,220,72,13,1,108,520,1063,1207,836,364,98,15,1,208,

%U 1120,2608,3452,2871,1563,560,128,17,1,401,2386,6233,9424,9153,5987,2682,816,162,19,1

%N Triangle read by rows. The Riordan square of the tetranacci numbers (A000078).

%C See A321620 for the definition of the Riordan square.

%e Triangle starts:

%e [0] 1;

%e [1] 1, 1;

%e [2] 2, 3, 1;

%e [3] 4, 8, 5, 1;

%e [4] 8, 20, 18, 7, 1;

%e [5] 15, 47, 56, 32, 9, 1;

%e [6] 29, 107, 158, 120, 50, 11, 1;

%e [7] 56, 238, 419, 397, 220, 72, 13, 1;

%e [8] 108, 520, 1063, 1207, 836, 364, 98, 15, 1;

%e [9] 208, 1120, 2608, 3452, 2871, 1563, 560, 128, 17, 1.

%p # The function RiordanSquare is defined in A321620.

%p RiordanSquare(1/(1 - x - x^2 - x^3 - x^4), 10);

%Y Cf. A000078 (tetranacci), A160175 (row sums), A321620 (Riordan square).

%K nonn,tabl

%O 0,4

%A _Peter Luschny_, Apr 29 2022