A249307 - OEIS

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A249307

Triangle read by rows: A249095(n,k) * 2^k, k = 0 .. 2*n+1.

1, 1, 2, 4, 1, 2, 8, 8, 16, 1, 2, 12, 16, 48, 32, 64, 1, 2, 16, 24, 96, 96, 256, 128, 256, 1, 2, 20, 32, 160, 192, 640, 512, 1280, 512, 1024, 1, 2, 24, 40, 240, 320, 1280, 1280, 3840, 2560, 6144, 2048, 4096, 1, 2, 28, 48, 336, 480, 2240, 2560, 8960, 7680

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OFFSET

0,3

COMMENTS

Length of row n = 2*n+1;

T(n,2*n+1) = 4^n = A000302(n);

for n > 0: sum of row n = 7*5^(n-1), cf. A005055.

LINKS

Reinhard Zumkeller, Rows n = 0..125 of triangle, flattened

PROG

(Haskell)

a249307 n k = a249307_tabf !! n !! k