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 A261058 Column k=1 of A213221. 1
 1, 3, 10, 32, 106, 357, 1222, 4230, 14770, 51918, 183472, 651191, 2319626, 8288135, 29691760, 106611596, 383565754, 1382423748, 4990274016, 18039252192, 65292492328, 236595647526, 858231115540, 3116138603103, 11324267454946, 41186435585589, 149907159998452, 545997804435897 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Donatella Merlini, Massimo Nocentini, Algebraic Generating Functions for Languages Avoiding Riordan Patterns, Journal of Integer Sequences, Vol. 21 (2018), Article 18.1.3. FORMULA Conjecture: n*a(n) +(n-3)*a(n-1) +3*(-7*n+10)*a(n-2) +3*(n-1)*a(n-3) +40*(n-2)*a(n-4) +2*(-2*n+3)*a(n-5) +10*(-2*n+5)*a(n-6)=0. CROSSREFS Cf. A213221. Sequence in context: A297067 A063782 A071718 * A306295 A134952 A184436 Adjacent sequences:  A261055 A261056 A261057 * A261059 A261060 A261061 KEYWORD nonn AUTHOR R. J. Mathar, Aug 08 2015 STATUS approved

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Last modified October 19 20:58 EDT 2019. Contains 328224 sequences. (Running on oeis4.)