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 A322224 Row sums of triangle A322221. 4
 1, 1, 3, 21, 263, 5113, 143323, 5469469, 272621231, 17198531585, 1339483576579, 126230212270629, 14156618029163607, 1863256491324487945, 284412058373417063979, 49835992042915293448749, 9935494230180289986374655, 2236083847858473337146482449, 564194375066091341842030512979, 158608695106487347874486537531701 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Paul D. Hanna, Table of n, a(n) for n = 0..49 PROG (PARI) {A322221(n, k) = my(Sx=x, Sy=y, Cx=1, Cy=1); for(i=1, 2*n, Sx = intformal( Cx*Cy +x*O(x^(2*n)), x); Cx = 1 + intformal( Sx*Cy, x); Sy = intformal( Cy*Cx +y*O(y^(2*k)), y); Cy = 1 + intformal( Sy*Cx, y)); (2*n-2*k)!*(2*k)! *polcoeff(polcoeff(Cx, 2*n-2*k, x), 2*k, y)} a(n) = sum(k=0, n, A322221(n, k)) for(n=0, 20, print1(a(n), ", ")) CROSSREFS Cf. A322221. Sequence in context: A251573 A265002 A012131 * A221094 A098278 A269938 Adjacent sequences: A322221 A322222 A322223 * A322225 A322226 A322227 KEYWORD nonn AUTHOR Paul D. Hanna, Jan 01 2019 STATUS approved

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Last modified February 21 22:50 EST 2024. Contains 370239 sequences. (Running on oeis4.)