A353593 Triangle read by rows. The Riordan square of the tetranacci numbers (A000078).

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, 1, 56, 238, 419, 397, 220, 72, 13, 1, 108, 520, 1063, 1207, 836, 364, 98, 15, 1, 208, 1120, 2608, 3452, 2871, 1563, 560, 128, 17, 1, 401, 2386, 6233, 9424, 9153, 5987, 2682, 816, 162, 19, 1

Offset: 0

Author

Peter Luschny, Apr 29 2022

Keywords

• nonn
• tabl

Comments

See A321620 for the definition of the Riordan square.

Examples

			Triangle starts:
[0]   1;
[1]   1,    1;
[2]   2,    3,    1;
[3]   4,    8,    5,    1;
[4]   8,   20,   18,    7,    1;
[5]  15,   47,   56,   32,    9,    1;
[6]  29,  107,  158,  120,   50,   11,   1;
[7]  56,  238,  419,  397,  220,   72,  13,   1;
[8] 108,  520, 1063, 1207,  836,  364,  98,  15,  1;
[9] 208, 1120, 2608, 3452, 2871, 1563, 560, 128, 17, 1.
		

Crossrefs

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

Programs

Maple

# The function RiordanSquare is defined in A321620.
RiordanSquare(1/(1 - x - x^2 - x^3 - x^4), 10);