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 A355365 Central terms of A355360; a(n) = A355360(2*n,n). 7
 1, 3, 54, 1360, 41405, 1404102, 51126740, 1957600876, 77812428681, 3183756066040, 133302637049516, 5687179333193904, 246453229359401883, 10821674290217357756, 480561612716912592360, 21549547977144582750304, 974600584933918611940825, 44409401763058366474029057 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Paul D. Hanna, Table of n, a(n) for n = 0..60 FORMULA a(n) ~ c * d^n / n^2, where d = 51.3157915205364... and c = 0.1124829020506... - Vaclav Kotesovec, Mar 19 2023 PROG (PARI) {a(n) = my(A=[1, y], t); for(i=1, 2*n, A=concat(A, 0); t = ceil(sqrt(2*(#A)+9)); A[#A] = polcoeff( x*y*Ser(A) - sum(m=-t, t, (-1)^m*x^(m*(m+1)/2)*Ser(A)^m ), #A-1)); polcoeff(A[2*n+1], n, y)} for(n=0, 30, print1( a(n), ", ")); CROSSREFS Cf. A355360, A355361, A355362, A355363, A355364. Sequence in context: A003776 A222203 A224051 * A317663 A323325 A224304 Adjacent sequences: A355362 A355363 A355364 * A355366 A355367 A355368 KEYWORD nonn AUTHOR Paul D. Hanna, Jul 19 2022 STATUS approved

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Last modified September 17 19:10 EDT 2024. Contains 375990 sequences. (Running on oeis4.)