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3, 4, 6, 9, 13, 18, 24, 31, 39, 48, 58, 69, 81, 94, 108, 123, 139, 156, 174, 193, 213, 234, 256, 279, 303, 328, 354, 381, 409, 438, 468, 499, 531, 564, 598, 633, 669, 706, 744, 783, 823, 864, 906, 949, 993, 1038, 1084, 1131, 1179, 1228, 1278, 1329, 1381, 1434
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(1)=3; then add 1 to the first number, then 2,3,4... and so on.
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LINKS
| Index entries for sequences related to linear recurrences with constant coefficients, signature (3,-3,1).
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FORMULA
| a(n) = A152949(n+1) = 3+A000217(n-1). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 03 2009]
a(n) = 3+C(n,2), n>=1. [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 12 2009]
a(n) = a(n-1)+n-1 (with a(1)=3). [From Vincenzo Librandi, Nov 27 2010]
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MATHEMATICA
| s=3; lst={3}; Do[s+=n; AppendTo[lst, s], {n, 1, 5!}]; lst
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PROG
| (Other) SAGE: [3+binomial(n, 2) for n in xrange(1, 55)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 12 2009]
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CROSSREFS
| Cf. A000217, A152947, A000124, A152948, A152949
Sequence in context: A032720 A167928 A090867 * A005626 A030712 A025000
Adjacent sequences: A152947 A152948 A152949 * A152951 A152952 A152953
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KEYWORD
| nonn,easy
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AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 15 2008
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