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A084899 Binomial transform of heptagonal numbers A000566. 3
0, 1, 9, 42, 152, 480, 1392, 3808, 9984, 25344, 62720, 152064, 362496, 851968, 1978368, 4546560, 10354688, 23396352, 52494336, 117047296, 259522560, 572522496, 1257242624, 2749366272, 5989466112, 13002342400, 28135391232 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Binomial transform is A084900. 2nd binomial transform of (0,1,5,0,0,0,....).

LINKS

Table of n, a(n) for n=0..26.

Index entries for linear recurrences with constant coefficients, signature (6,-12,8).

FORMULA

G.f.: x(1 + 3x)/(1 - 2x)^3; a(n)=2^(n - 2)*n(5n - 1)/2.

CROSSREFS

Sequence in context: A180670 A268262 A293101 * A268622 A289364 A074443

Adjacent sequences:  A084896 A084897 A084898 * A084900 A084901 A084902

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Jun 10 2003

STATUS

approved

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Last modified May 23 03:10 EDT 2019. Contains 323507 sequences. (Running on oeis4.)