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A026389
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a(n) = number of integer strings s(0),...,s(n) counted by array T in A026386 that have s(n)=4; also a(n) = T(2n,n-2).
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1
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1, 8, 49, 272, 1440, 7428, 37730, 189808, 948909, 4724160, 23453001, 116207424, 575036475, 2842936320, 14046869575, 69378730880, 342590699955, 1691519468760, 8351553940355, 41235710124400, 203617691311370, 1005560117623204
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