OFFSET
0,3
COMMENTS
Triangle T=A177390 obeys: g.f. of row n of T^(2n) = (2n^2 + y)^n for n>=0.
PROG
(PARI) {a(n, p=2)=local(M=Mat(1), N, L); for(i=1, n, N=M; M=matrix(#N+1, #N+1, r, c, if(r>=c, if(r<=#N, (N^(p*(#N)))[r, c], polcoeff((x+p*(#M)^2)^(#M), c-1)))); L=sum(i=1, #M, -(M^0-M)^i/i); M=sum(i=0, #M, (L/p/(#N))^i/i!); ); M[n+1, 1]}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, May 25 2010
STATUS
approved