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a(n) = A001952(2*n+1).
2

%I #15 Mar 24 2021 15:44:11

%S 3,10,17,23,30,37,44,51,58,64,71,78,85,92,99,105,112,119,126,133,139,

%T 146,153,160,167,174,180,187,194,201,208,215,221,228,235,242,249,256,

%U 262,269,276,283,290,297,303,310,317,324,331,338,344,351,358,365,372

%N a(n) = A001952(2*n+1).

%H N. J. A. Sloane, <a href="/A115004/a115004.txt">Families of Essentially Identical Sequences</a>, Mar 24 2021 (Includes this sequence)

%o (Python)

%o from sympy import integer_nthroot

%o def A342280(n): return 4*n+2+integer_nthroot(8*n*(n+1)+2,2)[0] # _Chai Wah Wu_, Mar 16 2021

%Y Bisection of A001952.

%Y Cf. A187393.

%K nonn

%O 0,1

%A _N. J. A. Sloane_, Mar 16 2021