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 A316390 Number of permutations p of [n] such that the up-down signature of 0,p has nonnegative partial sums with a maximal value of three. 2
 1, 3, 28, 130, 1263, 8090, 88101, 724189, 8887448, 89401804, 1229179691, 14638611036, 223711095367, 3078744103979, 51892788554614, 810254535452378, 14955918856848519, 261173044555806630, 5245841953983851853, 101285541723126490941, 2201267668629421856324 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,2 LINKS Alois P. Heinz, Table of n, a(n) for n = 3..458 FORMULA a(n) = A262165(n) - A262164(n). MAPLE b:= proc(u, o, c, k) option remember; `if`(c<0 or c>k, 0, `if`(u+o=0, 1, add(b(u-j, o-1+j, c+1, k), j=1..u)+ add(b(u+j-1, o-j, c-1, k), j=1..o))) end: a:= n-> b(n, 0\$2, 3)-b(n, 0\$2, 2): seq(a(n), n=3..23); CROSSREFS Column k=3 of A258829. Cf. A262164, A262165. Sequence in context: A338791 A100019 A053132 * A048367 A095665 A145346 Adjacent sequences: A316387 A316388 A316389 * A316391 A316392 A316393 KEYWORD nonn AUTHOR Alois P. Heinz, Jul 01 2018 STATUS approved

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Last modified December 11 06:34 EST 2023. Contains 367717 sequences. (Running on oeis4.)