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 A257617 Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 7*x + 2. 9
 1, 2, 2, 4, 36, 4, 8, 388, 388, 8, 16, 3676, 12416, 3676, 16, 32, 33564, 283204, 283204, 33564, 32, 64, 303260, 5538184, 13027384, 5538184, 303260, 64, 128, 2732156, 99831564, 465775352, 465775352, 99831564, 2732156, 128 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Row sums are: 1, 4, 44, 792, 19800, 633600, 24710400, 1136678400, 60243955200, 3614637312000, ... (see A144827). LINKS FORMULA T(n,k) = t(n-k, k); t(0,0) = 1, t(n,m) = 0 if n < 0 or m < 0, else t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 7*x + 2. EXAMPLE 1 2 2 4 36 4 8 388 388 8 16 3676 12416 3676 16 32 33564 283204 283204 33564 32 64 303260 5538184 13027384 5538184 303260 64 128 2732156 99831564 465775352 465775352 99831564 2732156 128 CROSSREFS Cf. A142462, A257627. Cf. A038208, A256890, A257609, A257610, A257612, A257614, A257616, A257618, A257619 Similar sequences listed in A256890. Sequence in context: A296048 A327011 A300361 * A309344 A257618 A088895 Adjacent sequences:  A257614 A257615 A257616 * A257618 A257619 A257620 KEYWORD nonn,tabl AUTHOR Dale Gerdemann, May 09 2015 STATUS approved

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Last modified February 22 12:33 EST 2020. Contains 332136 sequences. (Running on oeis4.)