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Search: id:A022265
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| 0, 4, 15, 33, 58, 90, 129, 175, 228, 288, 355, 429, 510, 598, 693, 795, 904, 1020, 1143, 1273, 1410, 1554, 1705, 1863, 2028, 2200, 2379, 2565, 2758, 2958, 3165, 3379, 3600, 3828, 4063, 4305, 4554, 4810
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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a(n)=A049453-A005475 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 21 2007
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FORMULA
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a(n)=7*n+a(n-1)-10 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 12 2009]
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EXAMPLE
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For n=2, a(2)=7*2+0-10=4; n=3, a(3)=7*3+4-10=15; n=4, a(4)=7*4+15-10=33 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 12 2009]
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MAPLE
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seq(binomial(7*n+1, 2)/7, n=0..37); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 21 2007
seq(binomial(6*n+1, 2)/3-binomial(5*n+1, 2)/5, n=0..42); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 21 2007
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MATHEMATICA
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s=0; lst={s}; Do[s+=n++ +4; AppendTo[lst, s], {n, 0, 7!, 7}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 16 2008]
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CROSSREFS
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a(n) = A110449(n, 3) for n>2.
Sequence in context: A121914 A110341 A116035 this_sequence A120389 A163490 A124150
Adjacent sequences: A022262 A022263 A022264 this_sequence A022266 A022267 A022268
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KEYWORD
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nonn,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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