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A077002 a(1) = 1, a(n+1) is the largest triangular number <= n*a(n). 1
1, 1, 1, 3, 10, 45, 253, 1770, 14028, 125751, 1256905, 13825911, 165902220, 2156701326, 30193705191, 452904989670, 7246477931241, 123190111062756, 2217421939553376, 42131016700673761, 842620333202031306 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..21.

MAPLE

a[1] := 1:for n from 2 to 100 do a[n] := floor(evalf(-1/2+1/2*sqrt(1+8*(n-1)*a[n-1])+1/10^50, 300)):a[n] := a[n]*(a[n]+1)/2:od:seq(a[l], l=1..100);

CROSSREFS

Cf. A077003.

Sequence in context: A099237 A006220 A020026 * A268224 A003704 A292181

Adjacent sequences:  A076999 A077000 A077001 * A077003 A077004 A077005

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Oct 26 2002

EXTENSIONS

More terms from Sascha Kurz, Jan 26 2003

STATUS

approved

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Last modified July 21 04:40 EDT 2019. Contains 325189 sequences. (Running on oeis4.)