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A101552 C(n-3,3)+C(n-7,7)+...+C(n-(4*floor((n-4)/4)+3),4*floor((n-4)/4)+3). 1
0, 0, 0, 0, 0, 0, 1, 4, 10, 20, 35, 56, 84, 120, 166, 228, 322, 484, 785, 1352, 2396, 4248, 7405, 12592, 20856, 33728, 53524, 83912, 130956, 204968, 323665, 517356, 837206, 1368108, 2248479, 3700648, 6077900, 9938488, 16164330, 26154700, 42146078 (list; graph; refs; listen; history; internal format)
OFFSET

0,8

FORMULA

G.f.: x^6/((1-x)^4-x^8); a(n)=sum{k=0..n, if(mod(k+1, 4)=0, C(n-k, k), 0)}.

CROSSREFS

Cf. A024490, A101551.

Sequence in context: A201722 A090579 A000292 * A038419 A057319 A034223

Adjacent sequences:  A101549 A101550 A101551 * A101553 A101554 A101555

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Dec 06 2004

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Last modified February 15 08:20 EST 2012. Contains 205729 sequences.