A317181 - OEIS

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A317181

Consider primitive integer triangles as listed in rows of table A316842. Sequence gives 16*area^2 for these triangles in the same order.

3, 15, 63, 35, 128, 135, 320, 63, 495, 275, 231, 576, 975, 99, 384, 819, 1344, 455, 351, 896, 1575, 2304, 143, 2975, 735, 675, 1536, 2499, 495, 1280, 2295, 3456, 4655, 195, 768, 1683, 2880, 4275, 5760, 1071, 2304, 935, 3591, 663, 1728, 3135, 4800, 6615, 8448, 255, 2223, 5775, 10143

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OFFSET

1,1

LINKS

Lars Blomberg, Table of n, a(n) for n = 1..3000

FORMULA

a(n) = 16*s*(s-a)*(s-b)*(s-c) where s = A316851(n)/2, and a,b,c are A316843(n), A316844(n), A316845(n).

CROSSREFS

Cf. A316842, A316852, A316846, A316847, A316848.

Sequence in context: A072336 A356421 A122671 * A067562 A062211 A369248

Adjacent sequences: A317178 A317179 A317180 * A317182 A317183 A317184

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jul 23 2018

STATUS

approved