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 A029848 a(n) = 1 + C(2*n,n) + C(3*n,n). 2
 3, 6, 22, 105, 566, 3256, 19489, 119713, 748342, 4735446, 30229772, 194242153, 1254381857, 8132826045, 52900345681, 345022543105, 2255449994038, 14773402692946, 96935423713906, 637019314585501 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..1000 MAPLE a:=n->1+binomial(2*n, n)+binomial(3*n, n): seq(a(n), n=0..20); # Muniru A Asiru, Aug 12 2018 MATHEMATICA Table[1+Binomial[2n, n]+Binomial[3n, n], {n, 0, 30}] (* Harvey P. Dale, Jan 09 2019 *) PROG (PARI) a(n) = 1 + binomial(2*n, n) + binomial(3*n, n); \\ Michel Marcus, Aug 12 2018 (GAP) List([0..20], n->1+Binomial(2*n, n)+Binomial(3*n, n)); # Muniru A Asiru, Aug 12 2018 CROSSREFS Cf. A000984, A096131. Sequence in context: A220166 A220167 A243336 * A117850 A090910 A256674 Adjacent sequences:  A029845 A029846 A029847 * A029849 A029850 A029851 KEYWORD nonn AUTHOR STATUS approved

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Last modified June 5 09:20 EDT 2020. Contains 334829 sequences. (Running on oeis4.)