

A068518


The sequence S(n,3,1,1), where S(r,k,t,q) is defined by Sum(0<=j<=r){combin(r+q,j)^t*B(j,k)} and B(j,k) is the jth kpolyBernoulli number.


0




OFFSET

0,2


COMMENTS

The sequence S(n,2,1,1), n>=0, is A016269. It would be interesting to study the more general sequences S(r,m,1,1), r=0,1,2,... for fixed m; here we consider the special cases m=3 and m=2. Finally, one can use the sum S(r,k,t,q) to discover certain recurrence relations involving polyBernoulli numbers. Let us note that the well known recurrence of the classical Bernoulli numbers yields S(r,1,1,1)=r+1. Let us also note that numerical experimentation suggests that S(r,2,1,1)=S(r,3,0,q).


LINKS

Table of n, a(n) for n=0..7.


FORMULA

S(r, 3, 1, 1)=Sum(0<=n<=r){combin(r+1, n)*[(1)^n*Sum(0<=m<=n){(m+1)^2*Sum(0<=s<=m){(1)^s*combin(m, s)*s^n}]}


CROSSREFS

Sequence in context: A198859 A160295 A125645 * A155664 A096192 A076458
Adjacent sequences: A068515 A068516 A068517 * A068519 A068520 A068521


KEYWORD

nonn


AUTHOR

Vesselin Dimitrov (avding(AT)hotmail.com), Mar 18 2002


STATUS

approved



