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 A099968 Second column of triangle in A099964. 2
 1, 2, 3, 6, 14, 31, 78, 235, 665, 1926, 5886, 21832, 75333, 266377, 933842, 3422282, 14954936, 61055379, 254751651, 1054728818, 4378056288, 18699691530, 94021272519, 443332334411, 2132051480643, 10181045388314, 48729093879838 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..750 MAPLE with(linalg):rev:=proc(a) local n, p; n:=vectdim(a): p:=i->a[n+1-i]: vector(n, p) end: ps:=proc(a) local n, q; n:=vectdim(a): q:=i->sum(a[j], j=1..i): vector(n, q) end: pss:=proc(a) local n, q; n:=vectdim(a): q:=proc(i) if i<=n then sum(a[j], j=1..i) else sum(a[j], j=1..n) fi end: vector(n+1, q) end: tr:={seq(n*(n+1)/2, n=1..30)}: R[0]:=vector(1, 1): for n from 1 to 30 do if member(n, tr)=false then R[n]:=ps(rev(R[n-1])) else R[n]:=pss(rev(R[n-1])) fi od: seq(R[n][2], n=1..30); # Emeric Deutsch, Nov 16 2004 PROG (Haskell) a099968 = flip a099964 1 -- Reinhard Zumkeller, May 02 2012 CROSSREFS Cf. A099964, A099965, A099966. Sequence in context: A032047 A032065 A307231 * A291401 A331875 A010357 Adjacent sequences:  A099965 A099966 A099967 * A099969 A099970 A099971 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Nov 13 2004 EXTENSIONS More terms from Emeric Deutsch, Nov 16 2004 Offset corrected by Reinhard Zumkeller, May 02 2012 STATUS approved

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Last modified November 28 06:42 EST 2021. Contains 349401 sequences. (Running on oeis4.)